You can experiment with the function Dual():
- Assign the value that you wanted to show inside the bars, to the textual part of Dual.
- Assign the same numeric value as the Bar's original expression, to the numeric part of Dual.
- Uncheck any graphical representation for the new expression and check "Values on Data Points"
- To show the values inside bars, select "Plot Values Inside Segments" on the Presentation tab.
You should be able to see the desired numbers plotted within the original bars.