Here's some kind of example https://youtu.be/foFX29CIB_w

Using a mouse and terminals, not very intuitive for a TV interface, maybe with time it gets better

Is mostly a interface for linux distros, so AndroidTV apps won't work.

Jellyfin Media Player (desktop app) have a TV UI, which kinda woks, on the article mentions an YouTube app called VacuumTube.

Is more an alternative for DIY home theater PC (like Kodi) than AndroidTV