Can we change the free keys to chests?????

I’ve been playing for a long time, practicing my champion pool and getting a lot of keys that I can’t use because I have no chests. Can you give us the option to change like 10 or 15 keys to a chest so that it doesn’t just stack up? I just find playing other champions boring compared to my pool so I don’t play them as much and I can’t get their chest.