Get Taxonomy or Create when not exists

taxonomy_create.php

<?php
public function taxonomy_create($label)
{
   delete_transient('wc_attribute_taxonomies');
   \WC_Cache_Helper::incr_cache_prefix('woocommerce-attributes');

   // These are exported as labels, so convert the label to a name if possible first.
   $attributeLabels = wp_list_pluck(wc_get_attribute_taxonomies(), 'attribute_label', 'attribute_name');

   //will produce
   //$attributeLabels = ['<att_name>' => '<att_label>']

   $attributeWCName = array_search($label, $attributeLabels, true);
   if (!$attributeWCName) {
      $attributeWCName = wc_sanitize_taxonomy_name($label);
      $attributeWCName = mb_substr($attributeWCName, 0, 27);
   }

   //$attributeSlug = 'pa_' . $attributeWCName;
   $attributeId = wc_attribute_taxonomy_id_by_name($attributeWCName);
   $taxonomyName = wc_attribute_taxonomy_name($attributeWCName);

   if (!$attributeId) {
      unregister_taxonomy($taxonomyName);
      $attributeId = wc_create_attribute([
         'name' => $label,
         'slug' => $attributeWCName,
         'type' => 'select',
         'order_by' => 'menu_order',
         'has_archives' => 0,
      ]);

      register_taxonomy($taxonomyName, apply_filters('woocommerce_taxonomy_objects_' . $taxonomyName, [
         'product',
      ]), apply_filters('woocommerce_taxonomy_args_' . $taxonomyName, [
         'labels' => [
            'name' => $label,
         ],
         'hierarchical' => false,
         'show_ui' => true,
         'query_var' => true,
         'rewrite' => false,
      ]));
   }

   return $taxonomyName;

}