Team Utilization For A Task

If I assign a Team to a Task let me be able to allocate Hours to that Team like a Job Role. I have a group of User in a Team with various Job Roles and I assign that Team to a Task. Then if I look at Utilization I don't see any hours for the Users. I don't know who on the Team is going to work the Task when I'm planing it so I don't want to assign Hours to a User or Job Role.