Feature request: total grid power (l1+l2+l3) on Vm-3p75ct

So i want to make a widget with
pv power grid inverter 1
Pv power grid inverter 2
And total grid power (l1 +l2 +l3)
But that last parameter doest exist

I even asked the ai and after 5 tries it admitted that the ting im looking for doesn’t exist and it recommended to post it here myself ( ai can’t call his supervisor for help, him the poor ting)