Thanks for the answer, I know about this method.
But the point is that I need to do multi-page PDF, with custom headers, depending on the content on the page. I tried to use pdfAddPageItem and pdfCreatePagesGroup, but since the scripts do not have access to this.$pdf, I cannot transfer anything to a header/footer.
My example above was the first step in this direction.

Hi!

Please help with the problem that I have missing page numbers when I try to get data from JS.
In this only 3 variables (__appDirectory, __rootDirectory, __parentModuleDirectory) that are not interesting to me. But I do not find input-data.

Perhaps you can look at my example and tell me what I'm doing wrong?