I have the same problem as you and solved it. You can add conditions to Function.php or add to the plugin:
1. Navigate to this plugin directory
2. Go to Includes -> class-wpel-front.php
3. Find fuction set_link and add conditions:
if (strpos (urldecode ($ url), example.com/test/’)) {
???????????? $ link-> set_internal ();
???????????? $ this-> apply_link_settings ($ link, ‘external-links’);
???????????? $ link-> remove_from_attr (‘rel’, ‘external’); // Remove this line to add external attr
???????? }