Adding a Hook with jQuery

Hello,

I need to add the following code for a date calculation with the form builder:

 jQuery(document).on( 'after.load.forminator', function( form_id ){

    // Get today date
    var d = new Date();
    var year = d.getFullYear();
    var month = d.getMonth();
    var day = d.getDate();
    // Today + 1 year
    var c = new Date(year + 1, month, day);

    document.querySelector('#forminator-module-1888 #hidden-2').value = c;

  } );

});

I understand I need to use a Hook for that but don't know which type of hook is best suited here.

Thanks!