Not yet! But the specification is still under very active development. We try, as best we can, to solve customer needs ahead of nice-to-haves (though the latter still important!).
Part of the point of the paper is assuming non-uniformity between APIs, hence the IDL.
ESDoc is JavaScript specific, but the concept of relying on comments to infer types is not, nor is the JSON format we store function execution information in. :)
(Well, I mean, we rely on JavaScript-translatable types — but can create parallels to other runtimes and languages.)