For my 220v circuits, I just put a sensor on one leg and them set it to multiple by 2x in the app. For your single application high load 220v circuits, that’s close enough for me.
Unfortunately, right now, the Emporia app does not offer a way of adding circuits together. It’s a very common feature requested by our customers, and we’re working on that to be launched in a future firmware update, but we still don’t have an ETA for that functionality.