Calculate workload & capacity for more than 1 assignee per task

How can I use Workload to view/plan our team’s capacity when more than 1 team member works on a single task?

We use paired programming. I really want to move our whole dev team into Asana, but am having a roadblock aligning our processes to the Asana platform. We create 1 task (user story card) and then 2 of our devs will work on it. I love the Workload tool but need to be able to make a single task “count” toward the workload of 2 team members at once. I know Asana doesn’t permit more than 1 assignee. Can I achieve this in a different way? What workarounds do you use?

Thanks!