Enable the use of 'Group By' field content in Map Series export File Names

[RTPL_AU]

Using Pro 3.5.2 you can create good looking map series. 

Please enable the use of field content specified in the Group By setting as part of the file name when exporting to multiple files.

A use case would be where a landholder (ddp key/Page Name) owns properties intersecting two projects. 
The Map series is Grouped By the projects.

It would make life easier if we could specify the Group By field content (i.e. project name) to be appended to the file name as well, to prevent multiple instances of page names overwriting each other, or us having to do manual things to work around the limitation.