Help With Showing Calculation in Hover Text

Hello,

I am seeing if there is a way to create a calculated field in the Hover Text. I am using a Sankey chart and looking in the Flow Options, but I am only limited to the available macros shown. I am not sure if there is a way I can create a beast mode and add it in the hover text or if there is a special function I can do to achieve.

From the screenshot, I essentially wanted to see as hover text: SINGLE FAMILY RESIDENCE / REFINANCE 726,570 (17%). I am using the 726,570 / 4,189,426 which is the (Number of Refinance of Single Family Residence) / Total Transactions