Import students without email

As a teacher, I'd like to import students without having to enter their emails since

1/ I don't have

2/ or don't want or don't have the right to use the emails of my students/pupils

3/ I don't need to call them upstream

4/ or I don't need to notify them by email of their results.

As a workaround, I have to enter unique random emails for each of my students and it's tedious. 🙈