As Google Chrome disables uBlock Origin and other unsupported extensions, rivals like Brave and now Opera have confirmed they will support it. The latter has explained how it hopes to do so.
I've been using a chromebook for the last 4 years and it's been great for my needs (youtube, streaming, porn, etc), but I am shopping for a windows machine now because fuck google.
I'm not too familiar with chrome books, i know some of them are insanely locked down to prevent this.. but see if theres a linux distro compatible with your chromebook, and if its possible to slap a linux install on it.