So Fediverse app #HolosSocial just added support for this in their latest iOS beta:
"Holos Social 1.5.5 (34)
Support for web+ap:// links (fedilinks): to open profiles and posts directly in Holos."
This is a big milestone for a key fix myself and Sean wrote about here, to help make remote fediverse content more seemlessly available. EVERY Fediverse mobile app should support this and follow their lead. 馃У 1/2 cc: @HolosSocial