String interpolation in AJAX call data parameter

I have a locale variable that can be en, fr, or es. I have to send an AJAX request, with the locale as the key of the data parameter.

let locale = "en";
let name = "example";
$.ajax({
  url: "/path",
  method: "PUT",
  data: {characteristic: {`${locale}`: name}},
  success: function(){},
  error: function(){}
})

I tried to use ES6's string interpolation, but it raises a syntax error. How can I do this ?

I'd like to get, depending on the locale:

{en: "example"}
{fr: "example"}
{es: "example"}