No, HUDs are hard-coded into the game, I struggled with this a while back when creating Clearing. I did what you want to do, as the teams ticket values are both math_counters. I also published my prefab of the Conquest gamemode which can be found here.
That's really the only option to display the values onscreen. If you want to display them in a central location of the map, though, you could do something that looks a bit nicer, as game_texts can be somewhat ugly.
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