I tell people it cannot be done. I have never yet read of anyone doing it where the result was satisfactory. Yet, I would guess we all live in hopes. If anyone did get LO6 working properly on their Chromebook please can they say here. None of the available solutions on the Internet have worked for me. My conclusion is at this point in time we can only get L0 5 but I would love to be proved wrong.
(I can see plenty of threads that say LO6 is not working via Flatpak or other methods)