How can i build this xml format ？

[lvlinkeji]

<voice name="en-US-JennyNeural">
    <prosody rate="+30.00%">
        Welcome to Cognitive Services Text-to-Speech API.
    </prosody>
</voice>

[amitguptagwl]

Do you want it to generate it from js Object? Here are few examples which may help you.