how to pass metadata in createUIMessageStreamResponse

[hassanzadeh]

Hey Guys,
When doing:

    model: openai('gpt-4o'),
    messages: convertToModelMessages(messages),
  });

  return result.toUIMessageStreamResponse(....)

We have the option to pass messageMetadata function. How do I do the same thing when I'm doing:

const stream = createUIMessageStream({execute: .... })
    return createUIMessageStreamResponse({ stream });

[lgrammel]

you could do it in the merge operation (when you call touimessagestream)

can you provide more details about your use case?