Competency and grades are two different things. Competencies are linked to Learning Plans (and Learning Plans Templates)
Competencies must be created in a competency framework, linked to a course and then can be linked to the desired course activity.
The students competencies are displayed on a Learning Plan block, not on a Course Completion report and not in the gradebook.
If you set up the Competencies and Learning Plans the students who have not completed the training activity will be displayed without a status. The Not Yet Competent scale value is not displayed. The Competent scale will be displayed to the students.
I recommend that you review the Moodle documentation for Learning Plans and Competencies.