I saw various guides about using PipUp on Android TVs for picture in picture notifications, but all relied on using a rest template command in configuration.yaml which, while it works, seemed a little hacky to me. So I created a (very basic) integration that provides a real pipup service in HA, with all the parameters PipUp supports.
It also adds a service to set up the overlay permission, and a service to start PipUp in case it is not yet started, that you can call on a schedule, or when your TV turns on.
It relies on the Android Debug Bridge (androidtv) integration.
I’m considering also adding a service for the download/install of PipUp on the device, but will probably need to support a selection from various sources, since people have modified the now unmaintained source repo with additional features.