I wish Brave/YouTube weren't such a dismal experience on Chromebook. You can't click on the red bar to jump ahead. You can't pause/restart by pressing the space bar. The navigation is awkward and crippled. Same for Firefox. I guess they're all using the same engine.
The only decent browser is Chrome, and the ad blockers don't work anymore.
ChromeOS lets you run Android apps which integrate nicely enough (eg opening links in the app), and also there's the virtual Debian (by default) part that doesn't integrate as well but is more flexible. So yes, you can run other browsers although last I checked it was a little bumpy.
Last I checked Brave had no support for large screens (tablets, foldables, chromebooks) on Android at all - it was horrible from usability perspective.
The only decent browser is Chrome, and the ad blockers don't work anymore.