Hashtag channel name autocomplete based on category

I couldn't find a proper way of doing this, that I will leave to you guys, but:

This is the scenario:

  You have a Category "Art" and inside several channels, "2D", "3D", "VFX" and several more. Let's say someone wants to tag a channel from the "Art" category but, wants to search through all the possible channels inside that category right there, in the autocomplete panel, instead of having to look for that category and all the possible channel in the channels column because that would mean having to scroll through that column and maybe even have to click on a collapsed category and loose focus of the autocomplete panel. That person just wants to type "Art" and have the possibility to see autocompleted channels that have "art" in their names AND also channels that belongs to the "Art" category.

It's complex, but it would be a golden feature I believe.

Cheers