Grafana Recovery Alerts send to GitLab


I am using Grafana to create Alerts and I want to send them to my GitLab to create Incidents. This works so far, but I also want to resolve the incidents as soon a recovery Alert from Grafana arrives. The problem is, that Grafana always sends an invalid endTime “0001-01-01T00:00:00Z”, when the Alert is still firing, and therefore GitLab cannot parse the payload.

Is it possible to edit that property or even remove it under certain conditions? I am using Grafana OSS. I would be really really happy to get some help. Kind regards!