Load raster layer from gpkg file

I’m new with PyQGIS.
I need to load a raster layer from gpkg file, and i tried this way:

gpkg_raster_land_layer = "GPKG:" + path_to_gpkg + ":" + layername

r_layer = QgsRasterLayer(gpkg_raster_land_layer, layername, "gdal")
if not r_layer.isValid():
    print("Land layer failed to load!")
else:
    QgsProject.instance().addMapLayer(r_layer)

But it didn’t work: Land layer failed to load!
I didn’t understand how to proceed to load the raster, can someone help me?

s_gpkg = "path_to_gpkg"
lyr_in = QgsRasterLayer(s_gpkg, "Test", "gdal")
if lyr_in.isValid():
    QgsProject.instance().addMapLayer(lyr_in)