CaptionTrack

{
  "type": "object",
  "properties": {
    "code": {
      "type": "string",
      "description": "Caption track code, e.g. en or de. Pass it as language to select this track."
    },
    "name": {
      "type": "string",
      "description": "Track name as YouTube reports it."
    },
    "generated": {
      "type": "boolean",
      "description": "True for YouTube automatic captions, false for a track the channel wrote or approved."
    }
  },
  "required": [
    "code",
    "name",
    "generated"
  ]
}