Possible to send e-mail after X% of a course is completed?

Hi,

is there a way to trigger e-mails when a user completed more than X% of a course? I can only find “when course is completed” and “when lesson is completed”.

Background: A lot of users do not mark the last lesson as completed. Workaround would be to trigger the e-mails after second last lesson is completed, but what if a user jumps between lessons and completes this second last lesson at an early stage…?

It would be great if it would be possible to set the trigger to >90% completed (or so). Is this possible?

Thank you very much!