Adding Additional Field to data label

Hi all,

I've created some volume fields in order to make a numerator and denominator for the below graph. It shows the percentages which is great, but I also want to add the volume field data label in there as well so the viewer can see it from that perspective. Maybe they can be in parathesis or with a comma, but I can't figure out how to add this detail to the chart. Thanks for any insight you can provide!