Load document by Url and save with watermark and html

PDF.js Express Version
Detailed description of issue

I want to add header and footer html as well on all pages. Simply load document and add watermark and html and download. I am using docviewer to add watermark. Then xfdfString string to create blob. but this blob does not have watermark. Or is their any api like https://api.pdfjs.express/xfdf/merge to add watermark and html to pdf and then download blob

Expected behaviour
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Does your issue happen with every document, or just one?
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Link to document
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Code snippet
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Hey there,

We do not support any document manipulation, so adding HTML to a page is not currently possible.

For watermarks, you can use the watermark rest API.