Feature request : one more price sensor (price for electricity returned to grid)

[djjassu]

Nowadays, quite a lot of people sell solar panels overhead back to the grid. At least here in Finland, the price is VAT 0, and it is deducted with a negative marginal (for example, in my case, -0.3 c/kWh).

Would it be possible to add more configuration values for the SHF so that there could be an option to configure additional sensors for the returned electricity?

That would need to show price with or without VAT (no matter what is configured to the current buying price option), and different (negative) margin price.

With that it would be possible to count the returned electricity price with the SHF script.