Have you checked out the application template called “Project Management”? In there you’ll find an example of how to manage prioritized tasks. The template does not sort tasks by priority out of the box, but if you wanted to do that, you could configure the sort. For example, on the my-tasks page, you could set the sort to Priority // A-Z:
You would also need to rename the priorities from High/Medium/Low to 1/2/3 or something else where an alphabetical sort of the names will function as a sort of the priorities.