FWI overlay available through the API

[JoacoChamo]

Hi! I'm looking to integrate one of our products with Windy but I can't see any documentation about the FWI overlay to use it with the API. Is that choice available for premium users?

I see that Basic users only have "wind", "temp" and "pressure" but can't see anything else about the fwi layer.

Furthermore, I see that the plugins documentation (https://docs.windy-plugins.com/api/interfaces/DataSpecifications.DataSpecifications.html#overlay) shows this overlay option but I need that confirmation.

Thanks!