Derive Macro FHIRJSONSerialize 

#[derive(FHIRJSONSerialize)]
{
    // Attributes available to this derive:
    #[fhir_serialize_type]
    #[rename_field]
    #[type_choice_field_name]
    #[type_choice_variants]
    #[primitive]
    #[code]
    #[cardinality]
    #[reference]
}