cinder/api-ref/source/v3/samples/volume_actions/volume-upload-to-image-request.json

{
    "os-volume_upload_image":{
        "image_name": "test",
        "force": false,
        "disk_format": "raw",
        "container_format": "bare",
        "visibility": "private",
        "protected": false
    }
}