How to send html variables to Sendgrid Template

I use Sendgrid Nodejs to send email to my customer, like this:

export function Orders_afterInsert(item, context) {
sgMail.setApiKey('SG.MKw1...');
const msg = {
  to: [{"email":item.customerEmail}],
  from: 'emotiony.store@gmail.com',
  cc: [{"email":"emotiony.store@gmail.com"},{"email":"emotionyproduction@gmail.com"}],
  subject: 'Emotiony xác nhận đặt hàng dịch vụ âm nhạc từ ${item.customerName}',
  templateId: 'd-d3d7f6...',
  dynamic_template_data: {
  cus_name: item.customerName,
  cus_service: item.serviceName,
  cus_phone: item.phoneNumber,
  cus_email: item.customerEmail,
  cus_class: item.customerClass,
  cus_deadline: item.customerDeadline.toLocaleString("en-US", options),
  cus_purpose: item.orderPurpose,
  cus_detail: [{
    "type": 'text/html',
    "value": item.orderDetail,
     }], 
  },
};
sgMail.send(msg); //TODO: write your code here...
}

Customer will input Order Detail with a html richtext .
Now i want send this html variables to Sendgrid template. With above code, Sendgrid template just load it as a text, not html with a format. Please help me right code. Thanks you all.