Get channels (price) on product from new-api

Hello, I’m using sylius 1.8 and I’m trying to get the product with its channels (price).

Can someone point me to a direction, whats the best way to obtain the channels?
Can I already do that with single call on the new api?
Or do I have to modify the API? If so how?

If you can profide a Foo example that would be helpful. Thank you.