Menu link attributes module
This module was tested on 7th December 2018, using Drupal 8.6.4 with DX8 5.2 using version 8.x-1.0 of the module.
There are no known issues using Menu Link Attributes with DX8.
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.