Jira issues file is XML file containing a list of issues. This file can be added to any Gaia template to generate new Jira projects containing a list of pre-defined issues.
...
If your issues have custom fields (these are automatically added in the XML file by the Jira exporter), Gaia will import the values of the associated custom fields (see supported custom field types) and associate the custom field to the project being created by Gaia.
...
Now that you have your own Jira template file, use it in a Gaia for Jira template. See how to create a template guide for more information.