Editing 'Description shown to end users' for Description field per ticket form

Hello, 
I would like to be able to change the 'Description shown to end users' for the mandated Description field per ticket form. 

For instance, I would like Ticket Form 'X' to have the Description field read: "Please submit the details regarding 'X' here"

and for Ticket Form 'Y' to read: "Please enter all data pertaining to 'Y' in the above box"

I would like to accomplish this without creating a specific 'description' field for each form. 
I have used the Guide Admin to auto populate and hide these fields (Subject & Description)on some forms before so I assume that this is possible. 

Thank you in advance for any recommendations!