Opinion on how to set up a invite-only access.

Hi there, I have a web app (react) that uses a self-hosted zitael IDP. It's currently configured, that anyone can login or register a new account and join my webapp. However, especially at the beginning I would like to offer a closed beta to a defined user group. At least I want to prevent that anyone can register for my webapp trough the idp. Best case would be to invite my beta-tester group via an invite link. Is this or something similar possible with zitadel? I use the legacy built-in login form.