Automatically add contacts as collaborators via Automation

Hi.  We are using external contractor to help us implement a new documents solution.  Those external contractor are as contacts in FreshDesk and need to have access to all tickets related to the implemenation without creating them as agents.  I then could f.e. create a automation that would give the collaborator rights if ticket type is in a certain way if they need to overlood all tickets and leave a note to help the staff to solve problems.