What I specifically mean by 'large media elements' is that I currently have the uBlock option active to 'Block media elements larger than [50] KB'. (Where the 50 is a spinner so I can increase or decrease the size if I want.)
I would like to know this, too. It does not seem to be on the list of features unless they are referring to it via "cosmetic filtering". I often block particular elements on websites.
There is an Aggressive setting for Brave Shields, which you can set either per-site in the Shields menu from the URL bar, or globally in brave://settings/shields - that should take care of SERP ads and other first-party placements.
There's no need to do it, their built-in adblocker supports the same rule lists.
https://github.com/brave/adblock-rust