setup.py not installing swig extension module

I'm struggling to figure out how to copy the wrapper generated by swig at the same level than the swig shared library. Consider this tree structure:

│   .gitignore
│   setup.py
│
├───hello
├───src
│       hello.c
│       hello.h
│       hello.i
│
└───test
        test_hello.py

and this setup.py:

import os
import sys

from setuptools import setup, find_packages, Extension
from setuptools.command.build_py import build_py as _build_py


class build_py(_build_py):
    def run(self):
        self.run_command("build_ext")
        return super().run()


setup(
    name='hello_world',
    version='0.1',
    cmdclass={'build_py': build_py},
    packages=["hello"],
    ext_modules=[
        Extension(
            'hello._hello',
            [
                'src/hello.i',
                'src/hello.c'
            ],
            include_dirs=[
                "src",
            ],
            depends=[
                'src/hello.h'
            ],
        )
    ],
    py_modules=[
        "hello"
    ],
)

When I do pip install . I'll get this content on site-packages:

>tree /f d:\virtual_envs\py364_32\Lib\site-packages\hello                            
D:\VIRTUAL_ENVS\PY364_32\LIB\SITE-PACKAGES\HELLO                                                                 
    _hello.cp36-win32.pyd                                                                                        


>tree /f d:\virtual_envs\py364_32\Lib\site-packages\hello_world-0.1.dist-info        
D:\VIRTUAL_ENVS\PY364_32\LIB\SITE-PACKAGES\HELLO_WORLD-0.1.DIST-INFO                                             
    INSTALLER                                                                                                    
    METADATA                                                                                                     
    RECORD                                                                                                       
    top_level.txt                                                                                                
    WHEEL  

As you can see hello.py (the file generated by swig) hasn't been copied in site-packages.

Thing is, I've already tried many answers from the below similars posts:

• setup.py: run build_ext before anything else

• python distutils not include the SWIG generated module

Unfortunately, the question still remains unsolved.

QUESTION: How can I fix my current setup.py so the swig wrapper will be copied at the same level than the .pyd file?

from setup.py not installing swig extension module