Replace source assets with custom ones in Release

Hi,

we want to preprocess the sources, before we attach them to a release.
We can add our own archives as asset links, which is fine, but the source archives automatically generated by Gitlab are still there. This confuses unfamiliar users.

So is there any chance to remove those from the release?
I tried to update the release with the gitlab release API (https://docs.gitlab.com/ee/api/releases/index.html), but so far without success.

Best regards,

Jan