3/

If you cannot get (most) regular people to write JSON-LD, JSON, or even HTML —

But, you might be able to get them (regular people) to write something similar to Markdown and INI —

Then, are there ways you could (explicitly or implicitly) encode JSON-LD type information, such as ActivityPub, into a Markdown-like or INI-like file — in a way where they (regular people) would likely include it?

I suspect — probably yes.