Brief Summary
Orion should be able to use other iOS apps as content blockers.
Details:
On iOS, Safari is able to use other apps (Firefox Focus, Adguard, etc.) as content blockers. This is particularly helpful since some of these apps may already contain a curated and very customised list of blocked URLs or domains.
It would be really useful to be able to load these apps as blockers on Orion as well. This is a separate issue from Orion's built-in blocking list, as it really allows per-user customisation.