How can I add text reviews for Movie metadata?

I see the official agent can fetch reviews of a movie like this:

I’m wondering if I can add reviews with the agent developed myself. Anyone can help?
Thanks for the absence of dev-documentation for decades, I still use the documentation ver 2.1.1. And I try to print the metadata object to log file, but Plex seems ban dir(), dict(), even JSON.StringFromObject() is failed

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