Set docstring style to 'auto' for external packages.

pip install griffe-autodocstringstyle

Enable the griffe_autodocstringstyle extension. Now all packages loaded from a virtual environment will have their docstrings parsed with the auto style (automatically guessing the docstring style).

Use the exclude option to pass package names that shouldn't be considered. This can be useful if you must first install your sources as a package before loading/documenting them (meaning they end up in the virtual environment too).

With MkDocs:

plugins:
- mkdocstrings:
    handlers:
      python:
        options:
          extensions:
          - griffe_autodocstringstyle:
              # only useful if your sources can't be found
              # in the current working directory
              exclude:
              - my_package