ReferenceContentItem

{
    "type": "image_url",
    "image_url": {
        "url": "string"
    },
    "video_url": {
        "url": "string"
    },
    "audio_url": {
        "url": "string"
    },
    "role": "reference_image",
    "property1": "string",
    "property2": "string"
}