Visual Composer Image field with Repeater Elements

The code
<?php
   
   
   function box_repeater_items_funct() {
       vc_map(
           array(
                 "name" => __("Box Repeater", "my-text-domain"), // Element name
                   "base" => "box_repeater", // Element shortcode
                   "class" => "box-repeater",
                   "category" => __('Content', 'my-text-domain'),
                   'params' => array(
                       array(
                           "type" => "textfield",
                           "holder" => "div",
                           "class" => "",
                           "admin_label" => true,
                           "heading" => __("Headig", "my-text-domain"),
                           "param_name" => "box_repeater_heading",
                           "value" => __("", "my-text-domain"),
                           "description" => __('Add heading here', "my-text-domain")
                       ),
                       array(
                         'type' => 'param_group',
                         'param_name' => 'box_repeater_items',
                         'params' => array(
                            array(
                               "type" => "attach_image",
                               "holder" => "img",
                               "class" => "",
                               "heading" => __( "Image", "my-text-domain" ),
                               "param_name" => "box_repeater_items_img",
                               "value" => __( "", "my-text-domain" ),
                           ),
                            array(
                               "type" => "textarea",
                               "holder" => "div",
                               "class" => "",
                               "admin_label" => true,
                               "heading" => __("Title", "my-text-domain"),
                               "param_name" => "box_repeater_items_title",
                               "value" => __("", "my-text-domain"),
                           ),
                            array(
                               "type" => "textarea",                            
                               "class" => "",
                               "admin_label" => true,
                               "heading" => __("Description", "my-text-domain"),
                               "param_name" => "box_repeater_items_description",
                               "value" => __("", "my-text-domain"),
                           ),
                        )
                     ),                    
                   )
               )
       );
   }
   add_action('vc_before_init', 'box_repeater_items_funct');
   ?>
   
   Displaying Fields Values on the Frontend with shortcode.
   =======================================================
   
   
   
   
   <?php
  

  function box_repeater_funct($atts) {
      ob_start();
      $atts = shortcode_atts(array(
          'box_repeater_heading'=>'',
          'box_repeater_items' =>'',        
      ), $atts, 'box_repeater');

      $heading = $atts['box_repeater_heading'];  
      $items = vc_param_group_parse_atts($atts['box_repeater_items']);

      ?>
      <div class="box-repeater">

          <?php  echo (!empty($heading))? '<h2>'.$heading.'<h2>': ''; ?>

          <?php if($items) { ?>
              <div class="box-repeater-items">
                  <?php  foreach ($items as  $item) { ?>
                      <div class="item-box">
                          <?php echo wp_get_attachment_image($item['box_repeater_items_img'], 'full'); ?>
                          <div class="info-box">
                              <h2><?php echo $item['box_repeater_items_title']; ?></h2>
                              <p><?php echo $item['box_repeater_items_description']; ?></p>
                          </div>
                      </div>
                  <?php } ?>
              </div>
          <?php } ?>

      </div>
      <?php
      $result = ob_get_clean();
      return $result;
  }
  add_shortcode('box_repeater', 'box_repeater_funct');
  
?>