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Plex is overhauling its apps with a redesign and under-the-hood upgrades
(www.engadget.com)
This is a most excellent place for technology news and articles.
You can open the Play Store on the Chromecast 4th generation (the one with Google TV), and from that you can indeed install the Jellyfin Android TV app (as Google TV is derived from Android TV apparently). However if you try to look for a Jellyfin app from the regular “Apps” menu there is nothing. Typical Google making it super convoluted.