'Set a default option for a given directive in Sphinx

In Sphinx, is there a way to set a default value for a directive option in conf.py, so that it is always used whenever I use that directive?

In particular, I am using autosummary, and I always want :toctree: to be set so that I don't have to write

.. autosummary::
   :toctree: r

every time, and I never have to worry about adding the :toctree: part.



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