I think this is tough partly because the fact that Harry Potter is a deliberate uneasy mix of high fantasy and school story means it's often quite confused about the various levels of stakes, and also because Ron and Hermione never quite reach the level of protagonist in their own right, which is what these descriptions are really meant for. They spend most of their onscreen time helping Harry with his goals, not pursuing their own, so defining them based on their own goals means extrapolating a ways out from canon.

But I would probably say Harry is 2 (he goes into most of the books with a plan of keep his head down, learn magic, spend time with his friends and win the Quidditch Cup, and fails miserably every time), Hermione is 3 (well often more like "relentlessly competent at using objectively deranged methods", the relentlessly competent and the objectively deranged are more relevant than the goals, but her personal goals tend to be things like "Take every single class that is offered even if that is more hours than there are in the day" or "teach Rita Skeeter a lesson"), and Ron is a tolerable 1, in that he does things like achieve "make friends at school" by befriending the Savior of the entire Wizarding World, etc.