Currently, Brave on iOS has very few flags you can toggle. The one I miss the most on iOS is the ‘Overscroll history navigation’ flag. This flag enables/disables swipe right and swipe left gestures to move through the browser history.
I use Brave on iOS for a page (Javascript application) which relies heavily on dragging & dropping elements on a page. This is very difficult when long swipes to left or right immediately set you back to a different point in the browser history.
Chrome on iOS does have this flag, so it seems like iOS does not block/prohibit it in any real way.