How to pass a variable from a callback to an external code?

Question

AJAX

In the console, step is equal to undefind, but it is necessary that the data from the incoming response be saved. If you need to use async / await, then where exactly in this example?

let step;
    
    $.ajax({
      url: "https://kachay.com.ua/calculation_info.php",
      dataType: "json",
      type: "get",
      success: function(res) {
        step = res.data.sum_step
      }
    })
    console.log(step)