These need to be separated from the main body of the text, and are best set with a smaller size and possibly event a different typeface and colour. The idea of any notes is that it is supplementary information and it is entirely optional that the reader even bothers to look, so setting in a style that does not distract from the flow of the reading experience is important.
Sidenotes Peter Kahrel
Sidenotes In Web Design ·
Word Processing API - Footnotes and Endnotes (v20.1)
Footnotes, Endnotes, Sidenotes and Popup Notes
Add footnotes and endnotes - Microsoft Support
How to create and customize footnotes and endnotes in Pages
Feature request for Substack: sidenotes, by trylks
Sidenotes / Marginnotes in Kirby - Questions 🤔 - Kirby
How To Insert Footnotes In Microsoft Word (And Endnotes!)