Postman and text to speech ("ssml" in body)

Hi
i use API of play.ht
but i have issue with “ssml”: string

My body:
{

“voice”: “Nicole”,

“content”: “example This tutorial demonstrates how to use”,

“ssml”: “string”,

“title”: “abc”, // Optional

“narrationStyle”: string, // Optional

“globalSpeed”: string, // Optional

“pronunciations”: { key: string, value: string }, // Optional

“trimSilence”: boolean, // Optional

}

API documentation:

POST and Request URL: https://play.ht/api/v1/
My header screenshot
clip_220305_124904
How can i set “ssml” in body?
Please help
Thanks