Keeping track of S ranks

I am unsure if this has already been thought about by rioters but i realized that without a system in place to show summoners with champions they have already unlocked chests for it can be quite tedious especially after a few months when a summoner might have a decent amount chests this way and no clue which champs they haven't acquired chests through. I feel this can be easily implemented by having a border around champions or an icon next to them in the champion window hope you take my idea into consideration if it is in fact new.