I believe this plugin may help: https://marketplace.atlassian.com/plugins/com.adaptavist.confluence.footnotes
The footnotes plugin allows you to quickly and easily add footnote references to your wiki pages.
You can:
- Define Footnotes - Define any number of footnotes throughout your content
- Display Footnotes - Display a table of footnotes anywhere in the page
- Quickly move between content and footnotes with a click of the mouse