According to this document and moodle forum : https://docs.moodle.org/403/en/Rubrics#How_teachers_access_the_rubric 

https://moodle.org/mod/forum/discuss.php?d=326389

If the teacher role is assigned the permissions mod/assign:submit, they will have the ability to view the ruberic table on the grading page before grading

I've tested this on moodle 4.1, but could not see it , it just makes the teacher appear in the gradebook.