I love the highlighting, annotation, and bookmarking features of Hypothes.is, but desperately wish I had more direct access to own this sort of data on my own website in a more straightforward manner. (I’ve already got a PESOS method, specifically I wish I had a POSSE method.)
This is something I've too thought about with Hypothes.is. On an annotation level it appears tricky to do, but things look more tenable when you go one step above annotations.
Hypothes.is allows you to create page notes – annotations on the page level. So, technically speaking, you could write a blog post on your own site, grab the Markdown, and push it into Hypothes.is as a page note. Would it be redundant for longer posts? Sure, but I think it could work for smaller ones where you are generally replying to a piece of content rather than annotating passages.
This is something I'll try out starting with this post. (view page note)