Support for flat rate charging

In three weeks I'll start to have a flat rate subscription to a charging network, it will cover both my home charging in the parking garage and sometimes when I travel outside the Super Charger network. So maybe a tick box to let Teslafi know a certain charger is covered by the subscription?

It would be nice to be able to input the monthly fee and know how much I actually pay per kWh so I can see if I should change to pay per usage instead.