The 'Friends vs Friends' experiences have that feature.
I used to have it as an option in the conquest experiences, but removed it in order to troubleshoot performance issues. It could be added again, but I need to figure out a good way to communicate it in the game. Before, I made a big sign with letters that explained what the buttons did, but some PC players' reports led me to believe that all the objects scaled and in close proximity to eachother in order to write letters, were crashing their games. I guess I would need to just do it differently as a world UI icon message or something.