I would love a way for the companion app to be able to keep tabs on battery level of connected devices to my phone and allow me to select ones which I’d like to become entities in Home Assistant.
I would see this working something like:
Companion App has a ‘connected Bluetooth devices’ page showing devices connected to the phone, and an option to make an entity in Home Assistant for it for the battery level.
Then, each time I connect that device to my PHONE, the home assistant companion app will sync the battery level to the home assistant entity.
This would allow me to create automations and remind me when the battery on my headphones need charging for example.