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This could be done in writing a RewriteMap containing the Bugzilla issue ID as a key and the JIRA issue ID as the value. The next step after importing the Bugzilla issues to JIRA is generating such a map.
 
Use the External System Import feature to import the Bugzilla issues to JIRA: secure/admin/ExternalImport1.jspa

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Each imported issue has (as you can see in the image) a field External Issue Id. This is in our case the old Bugzilla issue ID.

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With some simple steps we export the imported issues to the map in a format we need:

• Go to the newly imported project in JIRA
• Change the displayed columns
• Change the order of the columns using drag and drop
• Export to Excel
• Remove all unnecessary elements in the exported excel sheet and convert the links to plaintext
• Export Excel sheet to text file

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For our smartics-jboss-modules-maven-plugin the exported text file looks like this:

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