Has anyone here shareable experience with Libadalang for more than the examples that come with it?

What I'm looking for is to extract - for each subprogram in a spec - the name, the parameters (name & type), and the return type if any. I'm finding it really hard to understand the API reference.

At the moment I'm looking at the Ada API, having had grief with the Python version (to do with shared libraries on macOS) and with the Python API.

Seriously missing ASIS.