[Question] Modifying setup.py with pybind used in a submodule

If I have a module built with pybind as sub-module how would my already constructed setup.py incorporate this? For example, my package is structured like this.

\--package_home
         setup.py
         \--base_package
                 __init__.py
                 a1.py
                 a2.py
                 \--sub_package
                          __init__.py
                          [pybind .so module would go here]
                          b1.py
                          

先閱讀 setup.py 以及 issue 中描述的套件結構，特別是 base_package/sub_package 和預期的 pybind 共用物件位置。確定現有的 Python 型建置應如何整合該子模組，並記錄此結構所產生的設定。