The companion apps offer a lot of data and control from our mobile devices. Currently to control the device a notification needs to be sent to the device indicating what needs to be done. It would be great if some of these had proper domains for control instead of having to enter the command data.
Such as turning Bluetooth, Beacon Monitor, BLE Transmitter and High Accuracy mode on and off should all be switch entities
Changing the volume level should be a number entity per audio stream
Changing Do Not Disturb, Ringer Mode, Persistent notifications and WebView pages should be select entities
Some of the other commands could be button entities like requesting a location update.
Full list of the commands: Notification Commands | Home Assistant Companion Docs