WP-Bakery-Grid-Stars-Rating.php

<?php
//** WooCommerce Stars Shortcodes ***********
//********************************
add_filter( 'vc_gitem_template_attribute_xyn_woo_stars_rating','vc_gitem_template_attribute_xyn_woo_stars_rating', 10, 2 );
function vc_gitem_template_attribute_xyn_woo_stars_rating( $value, $data ) {
   extract( array_merge( array(
      'post' => null,
      'data' => '',
   ), $data ) );
  $atts_extended = array();
  parse_str( $data, $atts_extended );
  $atts = $atts_extended['atts'];
  // write all your widget code in here using queries etc
  $title = get_the_title($post->ID);
  $link = get_permalink($post->ID);
  $terms = get_the_terms($post->ID, 'case_categories');
  $output = do_shortcode('[woocommerce_rating]');
  return $output;
}

add_filter( 'vc_grid_item_shortcodes', 'xyn_woo_stars_rating_shortcodes' );
function xyn_woo_stars_rating_shortcodes( $shortcodes ) {
   $shortcodes['xyn_woo_product_rating'] = array(
     'name' => __( 'Woo Stars Rating', 'sage' ),
     'base' => 'xyn_woo_product_rating',
     'icon' => get_template_directory_uri() . '/assets/images/icon.svg',
     'category' => __( 'Content', 'sage' ),
     'description' => __( 'Displays the product rating as a number of stars.  Requires the Better WooCommerce Stars Shortcode plugin.', 'sage' ),
     'post_type' => Vc_Grid_Item_Editor::postType()
  );
  return $shortcodes;
 }

add_shortcode( 'xyn_woo_product_rating', 'xyn_woo_product_rating_render' );
function xyn_woo_product_rating_render($atts){
   $atts = vc_map_get_attributes( 'xyn_woo_product_rating', $atts );
   return '{{ xyn_woo_stars_rating }}';
}

This uses Better WooCommerce Stars Shortcode to create the stars.