Grade Assignments in Moodle or Grade with Rubrics or Grading Guides in Moodle
Hi, I tried to create several Self-Assessor Groups for students. It allowed them self-assessment on a Moodle rubric. Sue Bradtke explained the steps with screenshots. I think you might also find some useful tips in the Gradebook forum here, on Moodle.
See Grader report and Gradebook features: https://docs.moodle.org/38/en/Grader_report