Composer environement config for vcs python packages

Hi !

In our company we would like to use some non public python packages that can’t be published on :male_detective:
When I look at documentation, I only find how to install pypi packages but nothing about git repo or custom Python Package Indexes url like we can use on classical requirements.txt file.

Is there a way to add a package from one of these two ways on composer_environment.config ?