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This should be possible - if you are using `awsx.ecs.FargateService` you can pass the output from the NLB into the `value:` of one of the environment variables passed to the container.

Would that value be like: `proxy_listener.defaultEndpoint.apply(e =&gt; e.hostname);`

Also, wouldn't I need to use `await` or something for this to work?

No - you can pass an `Output` as an `Input`. Doing so will implicitly await the underlying promise. See <https://pulumi.io/reference/programming-model.html#outputs> for more on this. 

I don't see where env var setting is documented