Set a key command to fade-in fade-out an audio clip

Hi guys!
I’m trying to set a key command so that I don’t have to drag the audio clip fade handle to the correct length every time I want a fade-in/fade-out applied to an audio clip.

In other words, (1) I would like to select the audio clip to which I want to apply a fade-in and fade-out, (2) press a macro key that applies a 4 milliseconds fade-in as well as a 4 milliseconds fade-out to the clip.

I do not want to use the auto-fade function because I only want to affect specific audio clips of a project, not all audio clips. Also, the auto-fade function is a “CPU hungry” function.

Thanks for your help…