Can't disable embedded video autoplay

I’m a bit stuck. I love how Brave blocks adds (particularly popups in CNN, but also others), but I’ve been completely unable to disable the autoplay of videos (also CNN). I’ve tried several items including adding cnn.com somewhere in Brave without any success. First, why can’t this be global and if I’d like I can just add sites where autoplay of video is okay (or even it’s a binary global choice). Alternatively, where will it actually work if I have to do this site-by-site? Nothing I’ve tried works.