How to capture cherry-pick of merge request with a webhook

Changes merged to a release branch need to be duplicated on our develop branch and we are using the cherry-pick function on the closed merge request to do this. How would I capture these events in a web hook? There is no merge request event for this action. I tried the “push event” webhook but saw nothing when I cherry-picked. Is this possible?

The requirement is to update our job-card system with the information that the change has been copied to develop. Any way of doing this would be fine.

We are using GitLab Community Edition 14.0.1