Get form field inputs in expression builder

At the moment it is just possible to get the form field values and if it is changed, but if I want to register e.g. a change event on the input field it is just possible to get it manually using jQuery.

It would be nice to have an option in the expression builder to select an input field of a form and get its DOM object to do further stuff.

Example:

[[WorkAddress.FormField]].find("input").change(function() {

  doSomthing();
});