feature request: show price and also percentage in energy monitor

[lattice0]

On the Energy Monitor, on Individual Devices Total Usage, it shows the consumption in kWh, but not the price. It would be nice to know how much, in currency, each device spent. Maybe also a percentage of consumption of the entire house in the period.

Example:

fridge - 5.8kWh, $8.1 USD, 4%

which would mean that in the selected period it uses 5.8kWh, it cost 8.1 USD and it used 4% of the total consumption of the sum of all devices.

Its not nice to calculate each device usage in currency manually, I want to know how much each device costs me per month