@fncll Apologies for the late reply, but Mastodon doesn't support Webmention yet, and I don't spend much native time here.
I'm still tweaking some of the ways I'm using things, so most of it is based on importing data via RSS with a small amount of manual work. Ultimately I'll use their API to automate the entire piece. If you’re looking for something, Kris Shaffer built a Hypothes.is Aggregator that might serve as a model: https://pushpullfork.com/hypothesis-aggregator/
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!