It is possible to generate Datamatrix GS1 barcodes in InterFormNG. It is however only possible for ZPL print output.
In order to use this, the Datamatrix barcode needs to be entered like:
|(01)12345678901234(21)123456|(10)ABC123
The first | activates GS1 for datamatrix.
Fields that is not fixed length also needs to be terminated with the vertical bar: | (to indicate a FNC1 character).