The plug-in enables Teachers/Trainers to do it at course level.

You can use the User Import feature to enrol people into courses: Upload users explained - Authentication methods (totara.help)

If you include course1, course2, etc with the course short-name, it will enrol users into those courses, but only admins can action this.

There's a bit more info in the Moodle help docs: Upload users - MoodleDocs