How to install django packages in the self-hosted version

Dear Community members,
We recently started testing the koobotoolbox installation on one of our own servers.
We would like to extend the default Django features by installing additional packages (e.g., django-admin-sso). If we access the admin django panel via https://our_server_URL_/admin to integrate our SSO service but we cannot find a way to install additional packages.
Thank you for your time, consideration and any help you may provide.