Exploded pie chart (pie of a pie)

Create the pie chart using both the fund and project field. Then use the Drill-Through option on the chart: select the icon in the header with an arrow within a circle. When you then click on a fund section of the pie, the pie will then show the detail by project.

Or, use a report page Tootip if you want to keep the fund pie chart in view

 For report page Tootlips, see:

https://learn.microsoft.com/en-us/power-bi/create-reports/desktop-tooltips?tabs=powerbi-desktop 

Sample PBIX file attached