Adding comments to a JSON file

Can you and what would be the best way to add comments to a JSON file?

I've used //comments and "_comment"

No, comments of the form //… or /*…*/ are not allowed in JSON. This answer is based on:

• https://www.json.org
• RFC 4627: The application/json Media Type for JavaScript Object Notation (JSON)
• RFC 8259 The JavaScript Object Notation (JSON) Data Interchange Format (supercedes RFCs 4627, 7158, 7159)

Ref: https://stackoverflow.com/a/4183018/