@patriciapflaume @PaulSijpkes
I had no idea what single point rubrics were until I saw this post - and then google helped with the finer points.
Because you did not provide a scoring system, here is what I have come up with - this is the rubric in speed grader

Two notes - one all criteria values are 0 points. Not sure if that is what you wanted, but that allows for the setup. I took my format from my google result with the desired minimum work in the middle. Obviously depending on which criteria you choose, the comment block would apply to that criteria.
Second, in order for the order to be correct you need to use the 1, 2 and 3 or something similar to start each heading. With 0 points for each criteria, Canvas will alphabetize the criteria based on their heading.
If there are points for the middle criteria, then you have to put it in the heading stating what the point value is - and then of course you have to enter it in the box on the right.
I guess this solution is about 50% of the way to what you actually want. I would suggest submitting a feature request - but I doubt it would be implemented.
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