SDK Example for Native classes that work with v8?

In the recent excellent cycling74 YouTube video, Max 9 Javascript V8 with Joshua Kit Clayton - Discord Office Hours, there was a point in that video where Joshua mentioned:

"...you can build native classes that work with javascript (v8) and that's how we've done most of the new api. That's available, and how we wrap Jitter objects and all sorts of things like that and there's an example in the SDK, I don't have a link to it right now..."

I'm very much interested in this example, but I can't seem to find it in the min-api or the max-sdk-base. Can you someone in the know provide a link to this?

Thanks,

S