Description -Text formatting only applies to data within the columns in project view and user reports and cannot be applied to column headers and it looks like that is why change the color in the headers is not possible.
Why is this feature important to you - Our organization wants to stop using excel and have everything in workfront however custom the column headers like excel is not possible.
How would you like the feature to work - Change fill and font colors in the headers using an option or the text formatting.
Current Behavior - Header in the project views and user reports are not customizable filled color is gray and font color is black.