diff --git a/app/code/Magento/ConfigurableProduct/Block/Product/View/Type/Configurable.php b/app/code/Magento/ConfigurableProduct/Block/Product/View/Type/Configurable.php
index 26923fc9df837..fecb2dbedefd4 100644
--- a/app/code/Magento/ConfigurableProduct/Block/Product/View/Type/Configurable.php
+++ b/app/code/Magento/ConfigurableProduct/Block/Product/View/Type/Configurable.php
@@ -207,6 +207,8 @@ public function getCurrentStore()
 
     /**
      * Returns additional values for js config, con be overridden by descendants
+     * @deprecated Use composition approach to extend the Configuration (plugin for getAdditionalerConfig method)
+     * @see getAdditionalConfig to apply `after` plugin and extend an array
      *
      * @return array
      */
@@ -215,6 +217,16 @@ protected function _getAdditionalConfig()
         return [];
     }
 
+    /**
+     * Returns additional values for js config, con be overridden by descendants
+     *
+     * @return array
+     */
+    public function getAdditionalConfig()
+    {
+        return $this->_getAdditionalConfig();
+    }
+
     /**
      * Composes configuration for js
      *
@@ -245,7 +257,7 @@ public function getJsonConfig()
             $config['defaultValues'] = $attributesData['defaultValues'];
         }
 
-        $config = array_merge($config, $this->_getAdditionalConfig());
+        $config = array_merge($config, $this->getAdditionalConfig());
 
         return $this->jsonEncoder->encode($config);
     }