...
type: specifies the data type of the field/column, for multivalue filedsfields/columns use ARRAY_OF_x
isformula: if true, value will be computed using formula specified in formula, default value is false (note: not applicable for VIEWENTRIES* strategies)
formula: specify formula, which will be executed in the context of current doc (note: not applicable for VIEWENTRIES* strategies)
readonly: if true, includes the field only in output JSON
writeonly: if true: includes the filed only when reading JSON (works for POST/PUT methods only)