yes please! I am running currently Brave as default iOS browser, and the equivalent functionality is like this:
I have all toggles off, then when I need it I manually toggle the javascript (for example) toggle on for a site. This way running with js disabled keeps me safe, while enabling js per site makes remembering the site being usable.
this should be prioritized, please 
is there any way to workaround Apple's limitation and tap into private relay by somehow impersonating Safari or Mail?