It won't help you. Try to get letters from professors, physicians, employers only. Most schools have a max anyway, and they won't even read beyond that. You don't want to have them read a student's LOR and chuck your required LOR because it was one too many. If you have the required letters, you don't need supplements. If for some reason you can't get the required LORs, look at the school's current COVID policy for LOR's or call and ask. I'm assuming you aren't applying until 2021?