PDF reader: Access tags/related in PDF view (feature request)

Apologies if this has been addressed already (or if I am missing something obvious). The PDF reader is fantastic, but I really miss being able to access the tags while in it.

Oftentimes, I add tags as I read PDFs and while it is not a huge hassle to toggle back to the library window, it would nice to have it all in one place. In a perfect world, the "Info/Notes/Tags/Related" bar would be visible in the PDF reader view as well.
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