It is not possible to export Sense Sheets at the moment, there fore sheet objects will not be visible.
Using the community search feature I found a previous discussion on this point. The feature request is still on the road map. Look for this possibly in 2020 or later. Keep an eye on the contents of the NPrinting product release notes which provide information on added features.
The standard approach with designing NPrinting reports is the flexibility which allows you to select individual sheet objects identified by object id's in the template editor object viewer and add them to the report.
If you need some training with NPrinting we can put you in touch with our consulting group or other partners might be able to provide you with training as well.