Adding individual tasks to portfolios

I would like to add individual tasks to a Portfolio alongside Projects.

My team manages a large number of small projects (2-5 tasks), and we have found creating projects for these difficult to manage - we would end up with a hundred projects and I don’t think Asana is really designed for this.

For these small projects we would like to use a Tasks/Subtasks hierarchy rather than Project/Task. But we are also using Portfolios to track project focus for various stakeholders and the two don’t mix - we can only add Projects to Portfolios, not individual tasks.