I could not find a way to filter bounty questions by tag (e.g., Excel)
Is that possible at all?
EDIT ("research" inspired by answers)
Answers below explained why I was not seeing a featured tab for tag excel.
The way to arrive at an explicit message stating that there are no featured questions with a given tag is by first clicking on the featured tab, and then searching for the tag in the top right search field (excel in this case).