Yes, there is SamyGO, which is dedicated to Samsung TVs. https://wiki.samygo.tv/
There are custom firmwares, rooting methods, compatibility tables, etc.
There are forums where people root and hack on their TVs. I just saw a zero-click exploit for webos fly by my Twitter feed yesterday.
https://forum.xda-developers.com/t/rootmy-tv-coming-soon-dev...
Re:WebOS OSE 2.10
by kristofferR on Monday April 05, 2021 @12:21AM
(#26695326)
Thanks for that info, that's really interesting!
I made sure to turn off auto-updates on my C9, and when the warrenty expires there's hopefully some really cool things for me to try!
Is there an OSS alternate smart-TV firmware community?