Hello,
Sorry, but we don’t know plugins for this purpose. If you are using some plugin that adds its custom menu fields than in most cases it will replace our theme fields. Unfortunately, there is no way to make fields from two plugins or themes work together. As a workaround, you can temporarily disable your plugin and configure our theme fields. Then, enable it and our theme values will continue work. The problem is that you will have to disable the plugin each time you need to change our theme custom fields.
Regards