How to determine voice settings (voice_id), when creating avatar with template

Hi there,

I'm using this endpoint to create video https://api.heygen.com/v2/template/{{$json.template_id}}/generate

Parameters i'm sending

const body = {
caption: true,
remove_watermark: true,
title: TITLE,
dimension: { width: 720, height: 1280 }, // 👈 добавили безопасное вертикальное HD-разрешение
variables: {
script: {
name: "script",
type: "text",
properties: { content: script }
}
}
};

How can I determine voice settings in this case?