I would like to display some custom text about a row label while hovering over the cell (mouse-over)

I have selected the "show contextual tooltip" (pivot table options | Display) - is there any way to customize what this displays?

Unfortunately inserting a comment or a hyperlink is not possible on a pivot table. 

A comment with some VBA code to dynamically display hints would have been ideal!

Any ideas on how to achieve this?

Appreciate the help!