Rules are great but some rules should stay in the project level. If I assign a project lead to a task on any of the projects I need it to be added to their “to do” project, so they don’t lose track on it when someone else e.g a designer is tasked to help with it.
Hi @talsa and thanks for reaching out!
All the tasks you assign to your project lead will automatically land in their My Tasks 
You can learn more about My Tasks in this article: How to Get Started With Asana My Tasks | Product Guide • Asana Product Guide.
Hope it helps!