Can object types for the Python domain be extended?

[pawamoy]

It's unclear whether Sphinx rejects/tolerates/supports/encourages/discourages the extension of object types within the Python (py) domain. Some extensions like sphinx_toolbox.more_autodoc or sphinx-paramlinks add object types like enum, protocol and parameter. These can be found in inventories in the wild, even in packages in the top 500 PyPI packages.

I'm asking because I myself generate inventories with parameter and typeparameter object types from mkdocstrings.

I'm coming from this discussion: mkdocstrings/python#339 (comment).

Would love to learn about Sphinx's stance on this matter 🙂