When setting up a rubric using outcomes, it would be beneficial to add descriptors explaining how an outcome is used in a specific assignment.
The first image is the rubric I'm able to create within Canvas. The second image is the same rubric with explanations for the ratings. There are many different ways to approach adding descriptors onto the rubric. The method I choose would require a description section added to the ratings. Another option would be to add a description section to the criteria once the outcome is selected.
Canvas rubric using outcomesRubric with explanation of outcome and ratings.