Can't disagree with any of the comments.
I was modeling my idea based on the very simple (and not very flexible) way the CSS content property, and the counter-increment and counter-reset properties work (except using HTML comments in-line instead of CSS.)
For general-purpose-ness, will you expose book and file metadata to the function language, such as {tags} and {title} and {comments} and {filename} and {create_date}?
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