Can you enhance add to sequence functionality

I set up a lot of serial shortcuts,G,G return to the home page,G,R Go back to the original folder,G,T go Back to root directory.When I press the G key, it just waits for my input, doesn't prompt me for the next action, and doesn't autocomplete the shortcut key.
I wish it would be like a chrome browser plugin surfingkeys,When I type G, optional shortcut keys and hotkey descriptions pop up automatically in the lower right corner of the window

A Find-As-You-Type script could do that.

I don't know how to program, FAYT can refer to too few scripts, can you give an example, I modify the style I want according to the example