How to create Custom Approval Subject email Notification for Employee/Line Manager?

Hello Every one,

Does any one know how to create/add custom subject line email notification for employee/line manager ?

I am able to create custom subject line which is generalized w.r.t to BPM Approval rule but i can't create new separate message for Employee and seperate message for manager of same BMP Approval rule.

Example: There is a BPM Approval rule "LearningRequestApproval" which i need to modify the Title but i was able to modify as Generalized Title but not different Title for employee and different Title for Manager on same BMP Approval rule for "LearningRequestApproval" as per below screenshot.