Is there an in-game way to match-make for a specific trial?

It seems that if I select an activity I'm expected to bring my own people through direct invites. When I hit "group finder" it appears to act like a quick-match that will throw me into any trial, across any activity regardless of what I've selected.

I don't know if I'm missing the obvious but I don't see any way to select "Kill the Snitch" on Standard and queue for exactly that and only that.

Is that accurate or have I misunderstood something?