The only software that can work with and save .zpt files (templates) is Zoner Photo Studio, so if any dng to zpt conversion is possible, it would be done with this software. This looks like to be related to the use of Adobe Digital Negatives (.dgn) as a basis for new templates in Zoner Photo Studio.
If you have particular issues with making new templates in the software or trouble with import of .dng files, it would be perhaps best to contact Zoner support or some online community.