A Small Addition to Champ Select

I like that fact that I can click on my position and champions that can work in that position appears. As an addition to the current system, I think it would be cool if I can click on the mid lane tab and type "assassin" into the search bar so all champions that's not an assassin that also appears in the mid lane tab will be filtered out.

Example: When you click on mid lane during champ select these champions appear:

But if I also want to type in a class type while a position is clicked. If I type in assassin while I mid lane is clicked, I want these champions to show: