Maybe not exactly ‘good job’, because we don’t want it used sarcastically, if possible.
But maybe “Nice!” or Good Kill" or something along those lines. I avoid chat at all costs for various reasons, but use pings and emotes heavily to communicate instead, and I find our current options limited when it comes to affirming something positive in game. We have several redundancies in emotes, like “Go”, “Push Forward”, and “Press the Attack” all basically conveying the same thing. We can replace any one of those.
If a teammate solo-holds a point after everyone dies, or a friendly Widow lands a great shot, things like that, I’d like something to convey being impressed by someone’s performance.
Something more than “thanks”, which feels completely inadequate in those situations.