Ignoring the sketch when grading

I put in a sketch area for students to show work when solving (my students have touch screens), I have it as a self checking activity so it still tells students if they are right or wrong, but I would like to see if they are right or wrong on my dashboard without necessarily having to go through each screen. Is there a way to have it pretty much ignore the sketch the students did? For reference I am thinking about slides such as slide 9 in the activity attached. Thank you for any help, I just started tinkering with CL this school year so I have a lot to figure out still.

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readOnly: true

Works for any component that has a correct sink.