Coupon Code Search in Merge Field menu

Feature request on client behalf: 

Coupon codes currently display towards the bottom of the merge field menu with a blue text header showing the name of the coupon code, followed by merge fields containing the code, date created, and expiration. Typing in the name of the coupon code in the merge field pop up's search bar doesn't return that specific coupon code's merge fields, however. 

Client would like to be able to easily search for coupon code merge fields based on coupon code name, as they have many coupon codes and currently have to do a lot of scrolling to find the coupon code merge field they want to use.