Sometimes ChatGPT will add comments to JSON payloads to plugins. It will even notice it did this, say it will fix it, then do it again.
I know it’s been a hard day for ChatGPT (developers and operations), so I’ll cut it some slack. 
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I’ve been having a look at using this more relaxed parser - https://json5.org/
Should be a bit more forgiving but you’ll need to shoehorn it into whatever backend you are using which might be difficult.