Not sure about add-on but if you could export tickets from Zendesk in CSV or excel format, then can import into JIRA using external system import option in JIRA. But all fields from Zendesk should already exist in JIRA before import.
yep ... CSV is the way to go. Be forewarned it is not a painless task in all cases. I have done a number of CSV imports w/ varying degrees of success. it isn't hard but it is tedious.
Here are some lessons learned and things you will need to play with:
You know I would over my mercerny service for these imports if I didn't hate them so much. LOL!
Seriously, not that bad but tedious. if you have a few thousand plan a day.
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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