RE: "~There is no inherent support in JSON for a comment syntax. As a convention, content that would be comments in an XML representation is represented in a property with the name "fhir_comments", which is an array of strings, which can appear on any JSON object. This is heavily used in example instances, e.g. in this specification, but not usually used in production systems (and production systems may choose to reject resources with comments in them)"

I could find no example of JSON comments -need explicit example references or shown in this section.