Thank you for the inquiry. Unfortunately, Aspose.Words does not support SmartArt at the moment. Your request has been linked to the appropriate issue as WORDSNET-4987. You will be notified as soon as this feature is available.
It is to update you that SmartArt is preserved upon Docx to Docx rountrip and SmartArt is represented in aspose model as DrawingML. Moreover, Could you please share your scenario here? We will take a closer look and guide you accordingly.