What is a connector descriptor app???
What do you mean by 'build tool' for JSON? It's a plain text data interchange language. It's just a set of key-value pairs. It can't be compiled or executed, so you can't 'implement' anything with it and there is nothing you can 'build'.
Also, no real Trello developer would ever ask if there is something in the Atlassian Marketplace for anything to do with JSON.
Lastly, why you keep mentioning the inactive, unused account '@mention' is a mystery. Are you expecting that account from 2017 will come to life again and provide answers to you?
This is all nonsense.
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