Add bookings via API with custom rates

We need to import bookings (that are not from Airbnb or booking.com) to Lodgify. We have our own PMS that holds the data. Crearting a booking on Lodgify is OK but we can't define the rates. The "Quotes" only allow us to use the rates defined in Lodgify. But they differ from the rates in the bookings we have to import.

How to create/update bookings via API with a give rate like "200 € per day plus 80 € one time cleaning fee"?

When I GET "Price" object using the API it contains this inofrmation. But I can't define this object. Neither for a Booking nor for a Quote.