You are the first one (for me) who use subscript instead of superscript for this. Still it looks strange for me to have few items in a list and several paragraphs under the line, but it looks that it is either that, or insert all text to the list (maybe as second level).

When I write it in my language with ad, I am able to use it everywhere (book, email, forum) and it could be as long as it needs to be. I am just asking if there is something similarly universal in English. I like your answer, but I am not able to use it everywhere or maybe I just overcomplicated things.

Doesn't (see 1.) implying the opposite? Something like go there and see the full explanation (something like reference to tables or images)?

Interesting idea, but how to use it in an email? Or what if the text in the footer will be on more lines? Is it OK?