Expose main to worker, same remote-object-style

Could not find this in examples.

[`worker-rpc`](https://www.npmjs.com/package/worker-rpc) allows the worker to request values from main in a similar manner, (`await remote.func()`).

I understand you can pass callbacks using `Comlink.proxy`, but in some cases (an apparent) direct duplex communication indicates the intent better than passing the ball back-and-forth where the main should has first call a function, then the worker must memoize the callback etc.

Is this kind of duplex communication also possible with Comlink? What would be an example?

Thanks!