<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=352836) </details> <!--IssueSummary end--> There should be an API which allows listing the submodules (remote url, git ref) for a specific git ref of a Gitlab project. There are projects working around this [python-gitlab-submodules](https://github.com/ValentinFrancois/python-gitlab-submodule) but they require about 4 API calls per submodule which is quite resource intense. Therefor, it would be nice if this feature could be provided by the Gitlab API directly. The current [submodules API](https://docs.gitlab.com/ee/api/repository_submodules.html) only supports updating the git ref of an existing submodule.