On the Expressions tab select the expression and enable the option Values on Data Points. If that doesn't give you the result you're looking for please post an example document that demonstrates the problem.
Thanks for the response and I apologize for the lack of clarify in my initial question. I am using Qlik Sense - I believe I posted this question in the correct discussion area for Qlik Sense, but please let me know and I will close this and re-post.
The data point option is available under the Presentation menu for a Bar Chart:
I can not find the option under the Measures or the Appearance menu in a Combo Chart.
The option you are looking for is not available for combo charts currently. The relevant help topic is below. You can 'show data points' on a line or with 2 bars... but they just show a symbol not the data point value.