Data count on pivotchart columns?

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Without delving too much into the details, I'm going to be running a
pivotchart nightly (automatically in the wee hours of the morning) and the
pivotchart will be displaying the averages from data that has been
calculated. It would be very helpful, however, to know how many data points
were used to calculate those averages. Is there any way to display a data
count against the average calculated, or a good way to get around this to
display the count otherwise?

Thanks,