Idea for a buff for Ashe

I don't know how balancing works and don't want to pretend to, so this may be too much and therefore would need some sort of compensation nerf. But I think it'd be cool if when enemies are marked with frostshot, the damage increase that currently applies to Ashe's attacks only, applied to the whole team. I think this would help fufill Ashe's fantasy of being a leader, choosing the targets for her team to follow up on. And also help my support Ashe