Sum sensor helper as power consumption in Energy dashboard

I’ve got some GreenWave power strips (6 plugs) and I’d like to integrate the energy usage in my energy dashboard.
But I can only get them as 6 individual switches in my dashboard.
I know there are some hacks around (Sum sensor, How to do a sum of several sensors? - #2 by Heinz), but I think this should be possible without a single line of YAML.