I'm not adding specific features for heritages just because a player may select a heritage when that feature isn't available to the ancestry as a whole.
As Standard, elves have Low-Light vision. That gets added to all elves. At present, any changes due to a heritage need to be manually made by the player.
Retributive Strike is not a feat, it's a Champion class feature based off the Champion's cause. Feat's are very specific Pathfinder Second Edition entities, don't confuse them with class features or actions/activities.