personally I find it easy to import issues to Jira. What you need to do is create those projects in jira, create the custom fields matching to your projects. Then you can export your data, create a csv file, match the relevant fields with each other and import them.
you can take a look at this link for importing in jira: https://confluence.atlassian.com/jira/importing-data-from-csv-185729516.html
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