How to use an alias when creating sphinx autodoc for python packages?

Question

I have a folder structure for my python package something on these lines:

mypackage
├── subpackage1
│   ├── _somefunctions.py
│   └── __init__.py
├── subpackage2
│   ├── _classFunc.py
│   └── __init__.py
└── __init__.py

in mypackage.__init__.py file I have written something like

from . import subpackage1 as sp1
from . import subpackage2 as sp2

In my sphinx documentation I would want these subpackage to be

1. Listed under the submodules part when running autodoc
2. instead of listing the subpackage1, can this be listed as mypackage.sp1 and mypackage.sp2

I tried doing this but it didn't work:

sphinx-apidoc --implicit-namespaces -f -e -o docs/source spatialDNA/