Build the user-turn ChatMessage carrying the image as an image_url multimodal content block plus a text block asking the model to emit the structured output named by VisionLLMOutput.FeatureName.
image_url
Optional
Build the user-turn ChatMessage carrying the image as an
image_urlmultimodal content block plus a text block asking the model to emit the structured output named by VisionLLMOutput.FeatureName.