You can email/call the school and ask who to contact about submitting in an addition to your application!
I have to add something to my c&f and I’m just gonna call the school and ask who I should email for that.
What you need to disclose will depend on the school's application instructions and the exact wording of the C&F questions. Different schools will have different requirements.
You might want to email schools to ask specifically, but I think it's going to affect your chances, even at low ranked schools.
I've seen some high scores get denied because of C&F.