Android TV 12, released by Google in late 2021 (with major updates through 2023), is the operating system designed specifically for televisions, streaming boxes (like the NVIDIA Shield), and projectors. It is based on Android 12 (API level 31) but features a completely different user interface optimized for 10-foot viewing distances and remote control input.
Google provides for Android TV 12. These are not full ISOs but system.img files that can be flashed to Treble-compatible devices. Android Tv 12 Iso Download