Interface Idea: Add custom groups for champion select

So im still pretty new to League but I have unlocked a bit more than half of the currently available 123 champions. Due to the large number of potential characters to play I do have some trouble trying to choose which one seems most appropriate and I do often forget which ones I have unlocked. It also doesnt help that champions who act in certain roles are sometimes spaced out in champion select. If I have been assigned the role of Jungle then roughly 1/5 of the champions are not a viable option and it does waste time trying to look through all of them to decide which one I want to go with.

I propose implementing a method of allowing players to sort the champions into their own custom groups. So as an example, if I were to be assigned jungle then I would go to my previously sorted Jungle group and I would have all the champions I previously placed into that group readily available, including my preffered champions Diana, Rengar and Vi who would normally be spread out across the list.

As more champions are being introduced every few months it will only take more time for players, who are very careful about who to pick, to select a champion.

I am aware that there will be a client update in the following months so im not sure if this idea has already been implemented but if it hasn't then perhaps now would be a good time?