Importing a custom map exported from Google Earth to Gaia GPS

Hello everyone, I have a georeferenced map file (picture) embedded in a kml that I work with in Google Earth. I tried many ways to import it using Mapbox Studio, QGIS and following the instructions in the help section of the gaiagps.com, but with no success.

I attached a picture that shows how the map is stored in Google Earth:

Apologies for not beint too technical while explaining the issue, but I'm really a novice in this field.

Is there a way to export that file from Google Earth properly and import it in gaiagps as additional custom map layer?