How to extend frankenphp in Go?

[nickchomey]

I saw in these slides that frankenphp is extensible in Go, PHP and C. The examples in the documentation seem to only show how to use PHP, particularly for worker mode.

So, how would we extend frankenphp in Go? There's a particular library that I want to use that exists in Go, but not php. Do we have to create a caddy module? How would it get called?