how to send reasoning or tool call event?

[bearea]

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data: {"type":"TEXT_MESSAGE_CONTENT","messageId":"49da8187-c907-47a8-8f27-4d1d15f26fa8","delta":"Right，I can help you mark user info。"}

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This is my agent sse response，from llm translate to a2ui， but in my agent, there are many tool will be called, an some reasoning info I want to show, how can I send those type message?

It seems just support Part, TextPart, FilePart, DataPart in A2UI, send it with DataPart?