How to inherit config from default build.yaml file for custom configuration

Question

Dart build.yaml docs proposes this approach to build with custom configurations:

If you need other configurations in addition to dev and release, you can define multiple build.yaml files. For instance if you have a build.debug.yaml file you can build with --config debug and this file will be used instead of the default build.yaml. The dev and release flavors still apply. dart run build_runner serve --config debug will use the dev_options in build.debug.yaml, while dart run build_runner build --config debug --release will use the release_options in build.debug.yaml.

With this approach is there any way I can use default configs from build.yaml and only override some configs or add new configs in build.debug.yaml. Is this supported in any way?