"messages": [
  {"role": "system", "content": [{"type":"text", "text": "You are a helpful...."}]},
  {"role": "user", "content": [{
    "type": "text", "text":  "How many dogs are in the image?", 
    "type": "image", "text": <PIL.Image> 
    }]},
  {"role": "assistant", "content": [{"type":"text", "text": "There are 3 dogs in the image."}]}
],