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I think Articy is a bit of overkill for most people; it can be kind of clunky. I find Twine is usually enough for most games.
JSON is just a text file with some specific conventions to be easily readable by other programs. Though, I took a look at the Inky's JSON export, and it's kinda convoluted. In your case Arrow might be a better fit. You can also consult with your programmer, since he'll be the person implementing your dialogue in game.
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