Raw
    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.