Selecting columns from eager-loaded laravel models

I'm trying to select columns from related models, but I'm not quite sure how to do it using Eloquent (I want to avoid the DB namespace).

This is what I have so far...

$users = User::with("role", "country") -> select(["first_name", "last_name", "email_address"]);  

How would I go about modifying the select list so that it also includes role.title and country.name?

So essentially, my select list would look something like this:

-> select(["first_name", "last_name", "email_address", "role.title", "country.name"]);      

Many thanks!

via Chebli Mohamed