Give notification you have Solidarity when healing others
I just recently have been able to start using this perk, and I ran into a situation that was annoying but felt easily fixable.
While in a game where I had this perk equipped, I came across a survivor who was injured while also being injured myself. I started to heal them, but they would cancel it and start healing me instead. I would also cancel the heal since it would be better for me to heal them first. We went back and forth trying to heal the other first several times before I succumbed and let them have it. I thought maybe this was a case of both of us having the perk, but at the endgame screen I was the only one with it.
I believe when you have the perk equipped, and you heal another survivor while you're injured, they should get a notification that you have Solidarity. Feels like an easy enough QOL change that would benefit us solo players and slightly buff an underused perk.