Customize hotkey to navigate down a directory

I set up a custom hotkey (Alt+ Up Arrow) through the Command editor to go up a directory using the function:
Go up back

How can I do the same to go down a directory using Alt + Down Arrow?
I have tried Go FORWARD USEQUALKEYS but it is not working.
It should be the equivalent of pressing enter.

Go {filepath$} will navigate into the selected folder.

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