Schema Annotations in JSON Content Completion
A schema annotation is a documentation snippet that appears in the Content Completion Assistant offering more information about the current proposal.
This feature is enabled by default, but you can disable it by deselecting the Show annotations in Content Completion Assistant option in the Annotations preferences page.
Collecting Annotations from the JSON Schema
In a JSON Schema, the annotations are specified in the value of the 
    title
        and description properties like
        this:"idType": {
  "title": "The 'id' property",
  "description": "Specifies a required ID for this person.",
  "type": "string",
  "maxLength": 20
}