Ubuntu actually made a "Ubuntu TV" almost a decade ago that was based on Unity. It never had a TV actually go for sale with it (as far as I know) and the project was abandoned.

Now that you mention it I remember! But Ubuntu core is IMO better suited for this. I find it sad to see it go nowhere (visible to me at least), the value proposition is pretty clear to me, coupled to the snap store and with easy rollback and transactional updates it has all the tech to take it up with Android and WebOS.