How to add data to Auth::user()?

Question

Laravel

The users table has a city_id field
The cities table has a region_id field
It seemed to me that you only need to specify the links in the model, but this does not help, Auth: user() just comes with a number indicating the id of the city, but you need to specify the city (object) , and the city, in turn, indicated the region (also an object).
How to add this data to Auth:user()?