I am trying to privately publish my Flutter plugin, so that I can give access to it only to my company clients.

I read here that I can host my plugin in Gitlab, which I did, and now I am stuck on how do I share it with my company clients. Is it even possible to do so? If not, what could be my alternatives? I read about OnePub, but ideally, I would like to have full control over who is accessing my plugin.