I have an external WCS layer
https://maps.isric.org/mapserv?map=/map/nitrogen.map& SERVICE=WCS& VERSION=2.0.0& REQUEST=DescribeCoverage& COVERAGEID=nitrogen_5-15cm_Q0.5
that comes from an external data service, so I would like to save it in the postgis database so that I can then overlay the polygons on it and make graphic intersections to determine the type of soil on which the polygon is located respectively