How to skip artifacts backup with Gitlab Helm Chart

We are storing Gitlab artifacts on S3 and therefore we do not them in the backup. However, in the Helm Chart I do not see a option to skip artifacts. I have also tried to add the env variable SKIP=artifacts to gitlab-toolbox-backup but that seems not to work with Gitlab Helm.
Does anyone know how to skip the artifacts backup?

Update: I just found out that I can attach directly on the cronjob the running arguments --skip artifacts