Raw Json
rawJson returns this wrapper around a given raw JSON string, controlling how the JSON string is serialized:
If the JSON string was valid, it will be serialized inline without escaping it (using kotlinx.serialization.json.JsonUnquotedLiteral)
If it was not valid, then it will be serialized as an escaped string
In the JVM implementation, this class is also serializable with Jackson, with the same serialization behavior.