On this point, you can at least do this on a per-site basis in two ways. The easiest is to go to the site you want whitelisted, click the blocking notice, and whitelist by checking “Always allow autoplay on [site]”.
The other way is to go to Settings → Advanced → Content → Autoplay and add sites you want it allowed on to the whitelist (“Allowed”):
Agreed less Chrome-like UI would be nice, and many have complained, but there’s reason to hope this change will happened. See Brave, what happened? - #4 by MediaBird, for example.