Add ToolTip Fields Option to Sankey Chart

We are building out a page to show our pipeline progression showcasing the Sankey chart. Our flow widths are defined by the pipeline $$$ but it would be awesome if we could put the deal count into a tooltip so that the hover box could show the number of deals next to the $$$ included in each flow.

Could ToolTip fields be added to the Sankey chart so a count of deals (or whatever the user might want to include in the hover functionality) could be included?

Thanks!