How do I make an "async/await" operator for Jint?

I made a function in C# for Promise, Async and Await, but I don’t want it to be “async / await” functions in javascript, but an operator.

It works in my custom Jint.Engine like that

var async_example = async(function()
{
  return 2;
})
var t = async_example();
console.log(await(t))
// 2

But I would like it that way:

var async_example = async function()
{
  return 2;
}
var t = async_example();
console.log(await t)
// 2

I wanted to add the “async / await” operator to Jint. Please help me.