A request that we have been receiving on a few Heat Map cards is the ability to show row total #s and column total #s. We tried to use the Sumo card, but without the ability to fully format text, columns, etc, the view is pretty cumbersome.
@Casey_F you may have already figured this out, but just in case you didn't there are two types of heat map cards. One is in "Other Charts" and does not have the totals. The other is under "Table" and the "heatmap table" DOES include the totals. I'm not sure if that would help you or not, but wanted to pass along.