At the moment if you are downed you have three options, use grenade, heal up, or swap soldiers (assuming you have one). If you are the last squad member left and you are in an exposed position when you are downed, it is often not worth it to start the long process of reviving yourself. You just sit there for a few seconds, either waiting for a bot to finish you off or for the grenade you may or may not have to blow up. I think this little wait period is unnecessary, and there should be a button on the screen to just “give up” so you can spawn in a new squad.
This feature is present in battlefield and would be a nice QoL feature. You can do this already by going to the menu and pressing “kill soldier”. But it would be more convenient if there was a prompt on the screen so I don’t have to exit to the menu.