Hey @anon44310414 this is not currently available.
You can read about all features of task templates here: How to use task templates in Asana. • Asana Product Guide
As a workaround I suggest maybe creating one project that just contains just tasks that you use as templates. Then you would have to duplicate the tasks whenever needed.
Or duplicate into the relevant projects and then save as task template there also.
@Emily_Roman I think this could be moved to the product feedback category 