Chests acquired on Champions
Disclaimer: I have no idea if this has been submitted as an idea and I'm sure I'm not the first one to think of it.
I would like to propose the idea of the "Chest Acquired" function that exists in the Collections tab of the League Client also be show on champions in champ select. When you're looking to obtain chests it would be really nice to know in champion select which ones you have chest with and which ones you do not, rather than trying to look at them pre-game and remember which ones you could play for a chest. Often times I'll look at the collections tab and try to think of a few champs in each role, but in champ select often times the champ you use is effected based on picks before you (for the draft queues). I would find it useful and I'm sure many people would as well.