Hi @[deleted], I only know of two real ways to do it: with an application/add-on/plugin or by adding users directly to the database.
Check out Bob Swift's "Jira Command Line Interface (CLI)" which lets you do lots of stuff via CSV. https://bobswift.atlassian.net/wiki/spaces/JCLI/overview
There are two other things to mention, although, they may be of no use to you:
1. You can connect Jira to a central user repository (ex: Crowd, LDAP, GSuite) and never manage user access in Jira again!
2. You can also create users when importing issues via CSV. This is kind of a hack, as you'd end up with a bunch of issues you'd need to delete or close, but it's an idea.
Hope something in here helps!
Rachel Wright
Author, Jira Strategy Admin Workbook
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