Newbie Help creating a Plugin Action with JXA?

[DanThomas]

I got this working using AppleScript:

Get the Value of a Named Variable

** WITHDRAWN BY AUTHOR ** See this instead: https://forum.keyboardmaestro.com/t/get-set-value-of-variable-by-name-macro-examples/3893

But I'd still like to see this in JXA, or if that's not supported in Plugins, then plain JavaScript.

Thanks!