Support for inverting entity values for energy dashboard

I use an eGauge energy monitor to monitor every circuit in my house (!!). The typical way these devices are setup is that negative values constitute ‘consumption’ and positive values constitute ‘generation’

As such, most of my 30-something entities are negative. I could create template entities for all of them to invert the value, but that’s a ton of work.

What about adding an option when adding a device (or grid/solar) to the energy dashboard to invert the values?