Unlike what you did, here you can create new component in ftd itself, so there is no limit to how many such components you can create while authoring content.
This looks great. This is the first I have heard of ftd. It wasn't clear how to use it though. https://ftd.dev/docs/ doesn't link to the Installation, Getting started and Tutorial
Yeah, docs are pretty lacking. The language is in very early stage and has gone through some changes rendering existing docs out of date. Jan we created a 0.3 version of our syntax after 2 years or so of development and we feel good about it and have started updating the docs now.
This seems to be part of an ecosystem. But I'm not sure what are the advantages. What does ftd do better than markdoc and what can it do that markdoc can't?
The key difference is that ftd is a single full stack language. You can make api calls, write custom functions, build components, use components etc etc.
A language designed for authoring. But still powerful enough (one day, it’s work in progress) that you can build most UI in it.