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Jellyfin has some SmartTV native apps.

Or rather than making your panel dependent on some already-out-of-date-when-shipped embedded computing hardware, attach an external embedded computing device to the HDMI port (e.g. roku, firetv, appletv, shield, etc). and liberate your app experience to a more powerful device.

A Fire TV Lite (2020) starts at $30.

Would this mean a new remote? I've already got two (TV and STB), I'd prefer to have only one.

If your TV supports HDMI-CEC then most TV boxes will control both the TV audio and power with a single remote.

And most TV remotes will be able to control the third party box too, assuming it's not developed by total control-freaks beyond that of even a popular controlling fruit company - my fruitTV comes with the world's worst remote, but at least I can use my TV's remote to control the fruitTV too.

I mean I ask for alternatives in another comment, because they are not perfect, but Gerbera and miniDLNA do work. My LG TV supports DLNA natively, no app needed, it's just another source, like HDMI3.

Enby is a good alternative