json mode standard test (#25497)

Co-authored-by: Chester Curme <chester.curme@gmail.com>

libs/partners/ollama/tests/integration_tests/chat_models/test_chat_models_standard.py

@@ -22,6 +22,10 @@ class TestChatOllama(ChatModelIntegrationTests):
     def supports_image_inputs(self) -> bool:
         return True
 
+    @property
+    def supports_json_mode(self) -> bool:
+        return True
+
     @pytest.mark.xfail(
         reason=(
             "Fails with 'AssertionError'. Ollama does not support 'tool_choice' yet."