diff --git a/conversion/bert.py b/conversion/bert.py
index 2b82853994..32b71278fb 100644
--- a/conversion/bert.py
+++ b/conversion/bert.py
@@ -641,6 +641,11 @@ class ModernBertModel(BertModel):
         yield from super().modify_tensors(data_torch, name, bid)
 
 
+def _jinja_str(name: str) -> str:
+    # non-string values are rendered as JSON
+    return "{{ " + name + " if " + name + " is string else " + name + " | tojson }}"
+
+
 def _is_decision_checkpoint(dir_model: Path) -> bool:
     if not (dir_model / "encoder" / "config.json").is_file():
         return False
@@ -702,21 +707,22 @@ class ModernBertDecisionModel(ModernBertModel):
         with open(self.dir_model / "tokenizer" / "tokenizer_config.json", encoding="utf-8") as f:
             tokenizer_config = json.load(f)
         tok_cls, tok_sep, tok_mask = (tokenizer_config[k] for k in ("cls_token", "sep_token", "mask_token"))
+        description = _jinja_str("o.description")
         if self.hparams["decision"].get("architecture") == "JuliaDecisionModel":
-            option = "{% if o.description %}{{ o.description }}{% else %}{{ o.key }}{% endif %}"
+            option = "{% if o.description %}" + description + "{% else %}{{ o.key }}{% endif %}"
         else:
             option = (
-                "{% if type == 'choice' %}{{ o.key }}{% if o.description %}: {{ o.description }}{% endif %}"
-                "{% elif type == 'score' %}level {{ o.key }}: {{ o.description }}"
-                "{% else %}{{ o.key }}: {% if o.description %}{{ o.description }}"
-                "{% elif o.key == 'true' %}yes, the statement holds"
+                "{% if type == 'choice' %}{{ o.key }}{% if o.description %}: " + description + "{% endif %}"
+                "{% elif type == 'score' %}level {{ o.key }}: " + description
+                + "{% else %}{{ o.key }}: {% if o.description %}" + description
+                + "{% elif o.key == 'true' %}yes, the statement holds"
                 "{% else %}no, the statement does not hold{% endif %}{% endif %}"
             )
         # one marker token per option
         return (
-            tok_cls + "{{ type }} question: {{ instructions }}" + tok_sep
+            tok_cls + "{{ type }} question: " + _jinja_str("instructions") + tok_sep
             + "{% for o in options %}" + tok_mask + " " + option + "{% endfor %}"
-            + tok_sep + "{{ state }}" + tok_sep
+            + tok_sep + _jinja_str("state") + tok_sep
         )
 
     def set_gguf_parameters(self):
@@ -725,9 +731,11 @@ class ModernBertDecisionModel(ModernBertModel):
         self.gguf_writer.add_decision_type(gguf.DecisionType.LAYA)
         self.gguf_writer.add_decision_block_count(decision["head_layers"])
         self.gguf_writer.add_decision_max_head_tokens(decision.get("head_max_len", 256))
-        temperatures = dict(zip(("choice", "score", "noul"), decision.get("temperature", [])))
-        temperatures.update(decision.get("temperature_by_options", {}))
-        self.gguf_writer.add_decision_temperatures(temperatures)
+        for name, value in zip(("choice", "score", "noul"), decision.get("temperature", [])):
+            self.gguf_writer.add_decision_temperature(name, value)
+        # "choice:3-5" -> "choice.3_5", "choice:11+" -> "choice.11"
+        for name, value in decision.get("temperature_by_options", {}).items():
+            self.gguf_writer.add_decision_temperature(name.replace(":", ".").replace("-", "_").rstrip("+"), value)
 
     @classmethod
     def filter_tensors(cls, item: tuple[str, Callable[[], Tensor]]) -> tuple[str, Callable[[], Tensor]] | None:
diff --git a/conversion/qwen.py b/conversion/qwen.py
index 79b56e7b0a..17b31aef22 100644
--- a/conversion/qwen.py
+++ b/conversion/qwen.py
@@ -656,6 +656,11 @@ class Qwen3_5TextModel(_Qwen35MRopeMixin, _LinearAttentionVReorderBase):
     model_arch = gguf.MODEL_ARCH.QWEN35
 
 
+def _jinja_str(name: str) -> str:
+    # non-string values are rendered as JSON
+    return "{{ " + name + " if " + name + " is string else " + name + " | tojson }}"
+
+
 def _is_openjev_checkpoint(dir_model: Path) -> bool:
     return (dir_model / "helper" / "shim.py").is_file() and (dir_model / "config.json").is_file()
 
@@ -673,6 +678,7 @@ def _load_openjev_hparams(dir_model: Path) -> dict[str, Any]:
 @ModelBase.example("openjev/openjev")
 class OpenJevModel(Qwen3_5TextModel):
     model_arch = gguf.MODEL_ARCH.QWEN35
+    no_mtp = True  # the checkpoint has no MTP head
 
     # prompt and calibration follow helper/shim.py of the model repo (text lane)
     _LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
@@ -684,17 +690,17 @@ class OpenJevModel(Qwen3_5TextModel):
         self.gguf_writer.add_chat_template([{"name": "systemone", "template": self._systemone_template()}])
 
     def _systemone_template(self) -> str:
+        description = _jinja_str("o.description")
         option = (
-            "{% if type == 'noul' %}"
-            "{% if o.key == 'true' %}yes: {{ o.description or 'The statement is true.' }}"
-            "{% else %}no: {{ o.description or 'The statement is false.' }}{% endif %}"
-            "{% else %}{{ o.key }}: {{ o.description or '' }}{% endif %}"
+            "{% if type != 'noul' %}{{ o.key }}: {% if o.description %}" + description + "{% endif %}"
+            "{% elif o.key == 'true' %}yes: {% if o.description %}" + description + "{% else %}The statement is true.{% endif %}"
+            "{% else %}no: {% if o.description %}" + description + "{% else %}The statement is false.{% endif %}{% endif %}"
         )
         # newlines next to a block tag are emitted as expressions, so that trim_blocks cannot drop them
         return (
             "{% set letters = '" + self._LETTERS + "' %}"
-            "<|im_start|>user\nState:\n{{ state }}\n\nQuestion: {{ instructions }}"
-            "{% if type == 'score' %} Rate along the ordered levels below (lowest first).{% endif %}"
+            "<|im_start|>user\nState:\n" + _jinja_str("state") + "\n\nQuestion: " + _jinja_str("instructions")
+            + "{% if type == 'score' %} Rate along the ordered levels below (lowest first).{% endif %}"
             "{{ '\\nOptions:\\n' }}"
             "{% for o in options %}[{{ letters[loop.index0] }}] " + option + "{{ '\\n' }}{% endfor %}"
             "{{ '\\nAnswer with the letter of the best option only.<|im_end|>\\n<|im_start|>assistant\\n<think>\\n\\n</think>\\n\\n' }}"
@@ -703,11 +709,9 @@ class OpenJevModel(Qwen3_5TextModel):
     def set_gguf_parameters(self):
         super().set_gguf_parameters()
         self.gguf_writer.add_decision_type(gguf.DecisionType.OPENJEV)
-        self.gguf_writer.add_decision_temperatures({
-            "choice": self._TEMPERATURE,
-            "score":  self._TEMPERATURE,
-            "noul":   self._TEMPERATURE * self._TEMPERATURE_NOUL,
-        })
+        self.gguf_writer.add_decision_temperature("choice", self._TEMPERATURE)
+        self.gguf_writer.add_decision_temperature("score",  self._TEMPERATURE)
+        self.gguf_writer.add_decision_temperature("noul",   self._TEMPERATURE * self._TEMPERATURE_NOUL)
 
 
 @ModelBase.register("Qwen3_5MoeForConditionalGeneration", "Qwen3_5MoeForCausalLM")
diff --git a/gguf-py/gguf/constants.py b/gguf-py/gguf/constants.py
index 9ce78cf2f9..dab8445a9a 100644
--- a/gguf-py/gguf/constants.py
+++ b/gguf-py/gguf/constants.py
@@ -325,8 +325,7 @@ class Keys:
         # note: single-use-case keys can be hard-coded in cpp code
         BLOCK_COUNT        = "{arch}.decision.block_count"
         MAX_HEAD_TOKENS    = "{arch}.decision.max_head_tokens"
-        TEMPERATURE_KEYS   = "{arch}.decision.temperature.keys"  # "<type>" or "<type>:<n_opt bucket>"
-        TEMPERATURE_VALUES = "{arch}.decision.temperature.values"
+        TEMPERATURE        = "{arch}.decision.temperature.{name}"  # name: "<type>" or "<type>.<n_opt bucket>"
 
     class Tokenizer:
         MODEL                = "tokenizer.ggml.model"
diff --git a/gguf-py/gguf/gguf_writer.py b/gguf-py/gguf/gguf_writer.py
index 5dd585a0b6..1dee3fe115 100644
--- a/gguf-py/gguf/gguf_writer.py
+++ b/gguf-py/gguf/gguf_writer.py
@@ -1349,9 +1349,8 @@ class GGUFWriter:
     def add_decision_max_head_tokens(self, value: int) -> None:
         self.add_uint32(Keys.Decision.MAX_HEAD_TOKENS.format(arch=self.arch), value)
 
-    def add_decision_temperatures(self, value: Mapping[str, float]) -> None:
-        self.add_array(Keys.Decision.TEMPERATURE_KEYS.format(arch=self.arch), list(value.keys()))
-        self.add_array(Keys.Decision.TEMPERATURE_VALUES.format(arch=self.arch), list(value.values()))
+    def add_decision_temperature(self, name: str, value: float) -> None:
+        self.add_float32(Keys.Decision.TEMPERATURE.format(arch=self.arch, name=name), value)
 
     # for vision models