joystream/cli/examples/content/UpdateChannel.json

{
  "assets": [
    {
      "Urls": ["https://joystream.org/WorkingGroupOpening.schema.json"]
    }
  ],
  "meta": {
    "title": "Channel Title",
    "description": "Cool Description",
    "isPublic": true,
    "language": "eng",
    "coverPhoto": 1,
    "avatarPhoto": 1,
    "category": 1
  }
}