I can use Image.load() successfully but get a warning:
WARNING: Loaded resource as image file, this will not work on export: 'res://art/menu/screenshot-logo-bottom.png'. Instead, import the image file as an Image resource and load it normally as a resource.
When I try to workaround this, using load(), it returns a CompressedTexture object.
But how to convert that into an Image?
Or, is there a better way than load()?