Show preview of node-pin at function input when dragging variable

What I’m talking about is the new 4.8 improvement to Blueprint where you can drag your variable pin into the function input and it will create a new variable in the function input array as shown below (from 4.8 release notes)

My request is purely from a UX standpoint, it would be great if a preview pin was display telling people you can drop it on the function node to create this new variable input. As it stands now it’s very obscured and most people won’t know about it until they see it happen in a tutorial.