First, create a non-interactive user for JIRA in Gerrit.
Then, create a hook script that runs as patchset-created in Gerrit, and queries JIRA via some of its APIs to see if the ticked mentioned on the commit-msg, or the topic (this is a matter of preference), exists in Jira.
If positive, add a positive score as JIRA user to the patch, if not, add a negative score.
You can extend that to test more details from JIRA, as if the ticket is assigned or on the right state, and others.
This is very high level, you'll have to work the details yourself, but it's the easiest way to do it.
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