Migrating from SNOW to Jira - exporting data?

Apologies in advance if this has been posted incessantly and I've missed it!

Does anyone here have any experience migrating from ServiceNow to JIRA? My company's help desk is switching over soon, which is fine, but I've been told that they're not migrating any previous tickets/data from SNOW which really freaks me out, because that's like a decade of notes and documented work.

Wanted to see if there are any vendors/services that anyone here has used to export ticketing data (especially work notes) from ServiceNow, and import it into Jira? Any suggestions would be very welcome-- I have done initial research and found a few sites, but wanted to check for opinions here before I give out my contact info and start scheduling demos/appointments on this. :D