How do I rename field name based on a value in a matrix visual?

[tencount]

Screenshot above is the matrix I have and I'd like to change Visits field name to be something different depending on whether its BILLABLE or NON-BILLABLE.  For the NON-BILLABLE group I'm trying to change the Visits (e) to something else.  Is this possible?  

[Tom_Y · Accepted solution]

the easiest way is to further unpivot your table in power query, and add a "column" giving them a category "Visit/ Other name" based on value billable/ non-billable