Mob Targeting with controller

Can we get some help for targeting the Damage Reduction Aura Champions with controllers? When I have a large group of mobs while playing either on console or PC with a controller it is impossible to target a specific mob in a large group. This is so problematic when one of those mobs are a champion and gives every other mob the insane damage reduction. I feel like it should just be automatic that if we have a group of enemies, our character should just know to kill the champions first so that is what they should auto-target.

this is needed so bad. hard to push pit on console with the damage reduction champions