I confirm that you can embed only native HTML reports.
We strongly suggest to create a template of the same format of the output you want to obtain. So, if you want an HTML report please create an HTML template. This give you a better control of the output. You can use standard HTML as documented by the W3C to format your Qlik NPrinting reports.
Word templates support HTML as output format but you have not control of the generated HTML code. So we suggest to export a Word template as HTML only in case you already have created a complex Word template and you want not to recreate it in HTML.
Try to create a simple Word document (also outside Qlik NPrinting) and save it as HTML. Then open it with a text editor and check the code to see the difference. There will be a lot of unuseful instructions. I know that editig HTML seems harder that use the Word UI, but the results will be much better.
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