Unfortunately security levels are not at all implemented in the JIRA Importers plugin, although it's on our Roadmap, together with the JSON Export tool. https://ecosystem.atlassian.net/browse/JIM-1149
I can only think of REST API currently: https://docs.atlassian.com/jira/REST/latest/#d2e1200.
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I don't belive there's an easy when to do it, I think first you would need to import all of the data, and then update security information via REST.
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