Signing Commits/MR via Web UI

Hello everybody,

I already tried to search for it but was of little luck. Is there a way to have commits or MR signed which have been made via the web ui? I know there is such a feature on Github where some server signature is used (e.g. mentioned here). Does Gitlab (self-hosted) have a similar feature? If so, could you point me in the right direction (docs or similar) so that I can get familiar with it?
Thanks in advance.

Best regards Jörg