Menu item extras module
This module was tested on 1st March 2019, using Drupal 8.6.10 with Site Studio 5.4 using version 8.x-2.4 of the module.
There are no known issues using Menu item extras with Site Studio.
Link to the module
The module can be found on Drupal.org here.
Not working for you?
If this is not working for you, raise a ticket with our Customer Success team on our help center and we will look into your issue.