Cube View Excel Header Formatting

Is it possible to create a custom header on a cube view when viewing the report in Excel? 

I was able to create my custom header for the Report view but I can not find any options available to change the header font and size on the Excel view. 

I do see in the Application Properties where the Headers can be formatted, but I am looking to only modify one header for one customer and not all of the headers. Is that possible?