Add <embed> tag to the allowed list for the Table Rate Shipping description field

betrs-modify-allowed-html-tags.php

/*
 * Adds the <embed> tag to allowed tags in the Description field.
 *
 * Requires Table Rate Shipping for WooCommerce 4.2+
 */
add_filter( 'betrs_desc_allowed_tags', 'add_new_allowed_tags_betrs', 10, 1 );
function add_new_allowed_tags_betrs( $allowedtags ) {

    $allowedtags['embed'] = array(
      'src'               => true,
      'type'              => true,
      'allowfullscreen'   => true,
      'allowscriptaccess' => true,
      'height'            => true,
      'width'             => true
    );
   
    return $allowedtags;
}