### Describe the feature you would like to see It seems to me as if only [`AndroidConfig`](https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages#androidconfig) would be supported, but not [`AndroidNotification`](https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages#androidnotification). Alike this it's kind of difficult to set a `channel_id`... or where does one have to pass this array?