nxs isn't really designed for coding in. Best to load the package into Nexus and make the edits where you need.
But if you absolutely want to look at something vaguely human-readable, run it through a JSON prettifier such as https://jsonformatter.curiousconcept.com/ and in your text editing program replace all instances of \n with a newline.
Well the ship numpad system reflex package was easy enough for me to edit and add a key to halt the ship, but is it possible to alter the function keys based on which prompt is active?
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But if you absolutely want to look at something vaguely human-readable, run it through a JSON prettifier such as https://jsonformatter.curiousconcept.com/ and in your text editing program replace all instances of \n with a newline.