Hypothes.is has both RSS and Atom Feeds. So the IFTTT “if” is a new item in your feed which creates a text post in some appropriate storage account. I use OneDrive as the “that” target, but I’m sure you could potentially use others with some experimentation. If you have something that only saves as .txt files, that’s fine, you can simply rename them as .md files for your vault later.
I’ve described some of this before at https://boffosocko.com/2020/08/29/a-note-taking-problem-and-a-proposed-solution/ for those interested in further details.
Hopefully this helps (until someone has a more automated version).