I haven't seen anything yet on whether Brave will support it, though if I'm understanding correctly, they won't have a choice since they're using Chromium. Hopefully I'm misinformed.
IMO much bigger issue is that significant amount of non-banking sites that are now trying to shame user with "disable adblocker to continue" messages (easily bypassed) will start requiring this. Or Twitter/Reddit/etc., in the name of "fighting bots" of course, nothing to do with ensuring you are watching their ads...