Format percentages in tooltips

I have a number of visualizations across several dashboards that show percentages based on a count of an ID variable (in this case, JPOID). the visual below uses a count of JPOID, then using the "show as % of grand total" option. I want the percentage to read round to the nearest whole number in the tooltip.

I tried creating a new column in the dataset that I could then format as I saw fit, but it had an unintended consequence that makes it unacceptable.The image on the left shows the dashboard with the created column being used with a certain county selected, and the one on the right uses the show as percent option. Using my calculated column, when I make a selection in one visualization, the other ones that show percentages highlight that selection as a percentage of the whole, not highlighting the values of that selection.

Is there a way to round percentages in a tooltip without this lose of readability/interactivity?