Aria-required on jquery submit form

let's say has the following form

<form action="post">
     <label for="firstName">First name:</label>
     <input id="firstName" type="text" aria-required="true" />
     <input type="submit" value="submit">
 </form>

      

        
        
        
      

    

and with jQuery i want to do $.post()

i use the following jQuery script

jQuery(function($){
        $(SUBMIT_BTN).on('click', function(e){
            var data = $('form').serialize() + '&action=save_customer';
            $.ajax({
                url: MYRUL,
                method: 'POST',
                data:  data,
                success: function(response){
                    $('form').trigger('reset');
                }
            });
        });
    });

      

        
        
        
      

    

with this script the required aria does not work. how to trigger the check in this case?

PS: I want to use this aria-required

one while avoiding jQuery plugins