Python doesn't have a clear way to specify these, I am considering a couple different approaches:

• Python decorator

@extism.import("extism:host/env", "my_func")
def my_func(x: str) -> str:
    pass

• Import comments, something like

# import: extism:host/env my_func
def my_func(x: str) -> str:
    pass

• Putting imports into a separate JSON file - this is not a great option since it makes imports appear out of nowhere in the source

I'm currently leaning toward using a decorator since it seems like the cleanest integration, and should be pretty easy to parse.