Is there a way to create a cycle count accuracy metric on a Dashboard?

I’m trying to create a dashboard that displays the current accuracy of cycle counting. I’ve been able to create a table with all the cycle counts, and get each individual line’s accuracy by dividing variance qty by book qty. Unfortunately, I can’t just take the average of this field, as that would ignore the differing qty throughout the lines and thus not produce an accurate average. Is there a way to do this so the value could appear on a dashboard?