While I know there are fast keys for some of this, I do have a suggestion. It comes for my years having played BSGO where the target button spoiled me for focus fire. I have yet to see an easier or faster or more efficient and useful way to do it. IE I love this idea.
When in squad (here this would be group/wing) each player would have a button next to their name, on the right end. The button only showed when something was targeted. Then when someone was in the group/wing with others and clicked their button, you saw what they had targeted and also targeted the same item. Regardless of if in range or not, or any other object in game. It was great for fast focus fire, and for pointing out locations on the map in open space. I could sure use it here lol!