How to create description for each key of the JSON and header

I want to add a description for each key of the JSON and header key.

Example:
{
“user_name”: “user1”,
“password”: “password”
}
user_name (String): Description
password(String): Description

You can accomplish this by using the Description field within the Postman app’s request builder. Below are screenshots of the URL builder and what the published documentation looks like.

In-app

Published Documentation

Documentation:

Thank you very much.

This does not address one part of the question: “…add a description for each key of the JSON…” (I assume it meant the JSON body).