I love AndroidAuto. It would be great to get Nextcloud app integration with Android Auto. I would love to be able to play music folders directly from Androidauto from my Nextcloud. Or notifications to be displayed.
Developer Infos: Android for Cars overview  | Android Developers
Androidauto quick info: Android Auto provides a driver-optimized app experience for users who have an Android phone and the Android Auto app but don’t have a vehicle that uses Android Automotive OS. If a user’s car or aftermarket stereo system supports Android Auto, they can use your app directly on their car’s display by connecting their phone.