Public app that requires private package

I have create a simple app from the following repo : GitHub - mocquin/ZernikeStreamlit. The app is on the community cloud at : https://zernike.streamlit.app
I added the public requirements in the requirements.txt file, but my app also uses a private package that I would like to keep private. I couldn’t find a way to do this in the docs.
Is there a way to overcome this limitation ?