GenerateContentRequest

{
    "contents": [
        {
            "role": "user",
            "parts": [
                {
                    "text": "A cute cat sitting on a windowsill",
                    "inline_data": {
                        "mime_type": "image/jpeg",
                        "data": "/9j/4AAQSkZJRg..."
                    }
                }
            ]
        }
    ],
    "generationConfig": {
        "responseModalities": [
            "image"
        ],
        "imageConfig": {
            "aspectRatio": "1:1",
            "imageSize": "1K"
        }
    }
}