Freetube you can filter out channels by title. It’s a bit manual, but you can do it.

i don’t do smartphones, but i have this site bookmarked for other things and found these instructions there for the yt app: android and iphone/ios

for computers, there are third-party addons to add functionality to youtube’s web site. some provide point-and-click blocking functionality.

third-party apps, as long as they’re still ‘allowed’, may also have the extra functionality you’re looking for.