https://github.com/blikblum/luipack/blob/master/luicomponents/luijsonutils.pas#L140-L149Examples:
Result := DatasetToJSON(RequestItemsDataset, [djoSetNull], '');
or
DatasetToJSON(Query, TJSONArray(ResponseData), ConvertOptions, FOutputFields);
Where FOutputFields is '["id", "name", {"name": "sectorid", "mapping": "wardid"}, "registry", "gender", "birthdate", "admissiondatetime", "bednumber", "cns", "isolationdata"]';
The dbfield wardid will be exported with sectorid name