AssetImage not loading images from external package like flutter_gallery_assets

I am unable to load assets from external package like flutter_gallary_assets:

I have pubspec.yaml

flutter_gallery_assets: ^1.0.2

And in code:

  const Image(image: AssetImage(
    '/people/square/sandra.png',
    package: 'flutter_gallery_assets',
  )),

But I get:

Error while trying to load an asset: Failed to load asset at "assets/packages/flutter_gallery_assets//people/square/sandra.png" (404)

======== Exception caught by image resource service ================================================
The following assertion was thrown resolving an image codec:
Unable to load asset: packages/flutter_gallery_assets//people/square/sandra.png

It is like it does not get that it is from another package?