Comments provided by the HR while assigning a journey not visible to Employees

There is a request from HR that the comments they provide while manually assigning the journeys to the employees, the comments provided by them should be visible to employees. Either within the journey or in the journey assignment email notification.

I tried to edit the journey assigned alert template but could not find the attribute for comments. Please let me know if you have encountered the similar requirement and how did you achieve it.

Thanks in Advance!