[
  {
    "operation": "crop",
    "params": {
      "width": 400,
      "height": 360
    }
  },
  {
    "operation": "watermark",
    "params": {
      "text": "Hello World",
      "textwidth": 200
    }
  },
  {
    "operation": "convert",
    "params": {
      "type": "webp"
    }
  }
]