Export price sensors for Home Assistant

[ThorAlex87]

Is your feature request related to a problem? Please describe.
AMSreader sends future prices to home assistant, but with the fantastic new price configuration options it only sends the import price to home assistant.

Describe the solution you'd like
Add sensors for export price similar to the current import prices. As a minimum "Export Price current hour" so the energy dashboard can calculate prices correctly for those with solar installations.

Describe alternatives you've considered
Keep using the nordpool/entso-e integrations, where prices are complicated to update and almost impossible (for non-coders like me) to make prices change at the right dates.

Additional context
The new price feature is fantastic, and makes it really easy to set new prices in advance. But when using it with home assistant and solar it only works for imported energy, so I only really have half the equation.

PS.
I also tried using the "cost" and "Income" sensors, but they are not accepted by home assistant. Possibly this is due to them missing a state_class, but this is a bit out of my level of knowledge so I don't know.