Workarounds to add side-column footnotes in CMS items?

Anyone have any workarounds to add footnotes that show up in a side column (as shown in attached image)?

Easy enough to give the CMS item columns, keep main blog text in one column, but can’t think of how to set things up so I can choose the appropriate place in the column, and have the relevant footnote text show up. I guess each footnote would need to have its own field in the CMS item field, and you could bind text blocks to those footnote fields, but still doesn’t solve problem of how to position them within the body of the blog/essay.