Hi, this was one item on my large TODO list, but so far I was not able to get to it :)

I have no experience with Python packaging myself, do you think you could provide a proof-of-concept PR adding this? Thank you!

Idk if I would complete this #97 , might work on it later

This will have to be fixed for the next Pelican release (5.x) which supports importable modules. The old method is still supported, but it does not work for a package like plugin system which m.css has. See: https://pelican.readthedocs.io/en/latest/plugins.html