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  customPaging: function (slider, i) {
    var thumb = $(slider.$slides[i]).data();
    var textSlidDot = $(".slid_data_" + i).attr("data-mytext");
    return (
      '<div class="heading-slider"><span>' + textSlidDot + "</span></div>"
    );
  },

<div class="item slid_data_<?php echo $i; ?>" data-mytext="<?php the_sub_field('title'); ?>"></div>