This is really valuable for our use case. Has there been any progress on this pull request?
“at a later time” typically does not mean in 4 months, more like a year or more.
Your usercase can be done with shortcodes. One to add footnotes that uses scratch to collect the information and prints the link to the footnote and one to display all footnotes of a page. You should go in this direction if you need it right now.