With WebViewer this is answered in the following post
For server side such as Node it can be achieved directly from the TemplateDocument
https://docs.apryse.com/api/pdfnet-node/PDFNet.TemplateDocument.html#fillTemplateJsonToOffice__anchor
With WebViewer this is answered in the following post
For server side such as Node it can be achieved directly from the TemplateDocument
https://docs.apryse.com/api/pdfnet-node/PDFNet.TemplateDocument.html#fillTemplateJsonToOffice__anchor