From CSV, you can add by converting it to a jelly script (although I'd prefer to convert it to lines to feed into Bob's CLI, it's much easier), or you could create a dummy project, import your list as though they were issues with assignees, then delete the project when you're done.
JIRA Command Line Interface has addUserWithFile action.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.