{
  "annotations": Annotation[],
  "image": {
    "filename": string,
    "height": integer,
    "original_filename": string,
    "thumbnail_url": string,
    "url": string,
    "width": integer
  }
}
Annotation = Keypoint | BoundingBox | Polygon
Keypoint = {
  "keypoint": {
    "x": float,
    "y": float
  },
  "name": string
}
BoundingBox = {
  "bounding_box": {
    "h": float,
    "w": float,
    "x": float,
    "y": float
  },
  "name": string,
  // Sub Annotations (when enabled)
  "text": Text
}
Polygon = {
  "name": string,
  "polygon": {
    "path": {
      "x": float,
      "y": float
    }[]
  },
  // Sub Annotations (when enabled)
  "text": Text,
  "attributes": Attributes,
  "directional_vector": DirectionalVector,
}
Text = {
  "text": string
}
Attributes = {
  "attributes": string[]
}
DirectionalVector = {
  "angle": float,
  "length": float
}