Setting up a python package for setuptools/pip requiring the inclusion of relevant C based files

We are currently trying to set up a python (3.9) package that is wrapping our C SDK. The interface is built with SWIG and the module is already written. We are looking for someone to specify the package base files (setup.py, MANIFEST.in, etc) in a way that the already installed *.pyd/*.so files are included/linked in the respective environment on pip installation. The package should be pip installable both under windows and ubuntu (20.04+).