How to get this assitantMessage in the streaming response

desc：
It's easy to get an assitantMessage from the result in a non-streaming response, but there doesn't seem to be a straightforward way to get an assitantMessage in a streaming response, so I need to manually implement a complex logic to accomplish this. I'm wondering if there's a relatively simple and straightforward way to accomplish this?

Minimal：
chatClient.prompt().stream().chatClientResponse(); ...-> AssistentMessage

env:
java 17
1.1.0-snapshot

Start at the streaming entry point shown in chatClient.prompt().stream().chatClientResponse() and compare it with the non-streaming response path that already exposes an AssistantMessage. Determine the supported way to obtain that message from a streaming response; done means the behavior is straightforward and documented or otherwise demonstrated for Java 17 and the stated version.