How to install NEST's Python module into a specific site-packages directory?

The specific question at hand is:

How could I install the nest module of a NEST simulator installation into a specific site-packages directory of for example a pyenv/virtualenv?

But a broader explanation on how the Python module is generated and installed during the NEST CMake itself is certainly welcome. For example, where's the setup.py file that's used to install it? I suppose that if I knew that I could use pip to install the module anywhere I wanted. Another side-question is whether the Python module install target is configurable from CMake?

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