No.
1) Nothing we can do in the UI will write to any files the game does not already use. I suppose in theory you could use macros and /savehotkeys to get a quasi-output file, but that'd mean not having any other hotkeys on hotbars, and it still wouldn't really be anything close to what you're talking about. Your best bet would be to /say your stuff and have whatever program you want monitor that, ala already existing parsers
2) There is no way to have the game dynamically read a text file to display in the UI. The closest you might be able to get in that regard is either using the browser to display a html file or (if the result is in-game commands) using /dofilecommands
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