Visible notes in Scribble bibliography

I would like to include some reader-visible notes in the foo.bib bibliography for an article written using Scribble's LaTeX / PDF backend. How do I do that? I might require some lower-level LaTeX hacking.

Even the ability to insert text between "Bibliography" and the entries would be nice to have.

Recently I needed to insert a little text after "Bibliography" but had to put it in a separate section. It looks odd in the table of contents.

A closer look at the bibliography in the screenshot: It seems a space (or newline?) is missing between "1990." and "Publisher: Hermès".
The bib-entry looks like this:

@bib-entry[
  #:key "Abd90"
  #:author "Habib Abdulrab"
  #:title "De Common Lisp à la programmation objet"
  #:location "Paris"
  #:date "1990"
  #:note "Publisher: Hermès"
]
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