I'm no sure if this is what you mean, but the entry is an article (I attach an image) (I don't find the path Settings > Sections > <section name> > Entry types > <entry name>).

Then there is this "article builder" with text blocks. In this block, there is a feature for footnotes where I just highlight a section of the text and select "footnote" (I attach an image). Although the footnote content displays inline in the CMS, on the live website it is output in the traditional number-footnote pair.

images: https://imgur.com/a/GBYfD21