How to mark a merge request as draft per default

We want to mark each merge reques as draft, automatically.

The user should be able to remove the mark.
It looks like there is no setting for this feature.

As a workaround, I tried to run a pre-job (all other jobs “need” this job" which marks the MR as draft with a “/draft” comment. The MR is successfully marked as draft with this job, unfortunately it looks like this has no effect to the already scheduled pipeline.