Efficiently Fetching Admin Roles for All Users in Okta

Is there an api that can tell at one time which user on okta has which admin role?
Currently I am thinking of using the List all users api to get the list of users and the List all user role assignments api to get which admin role each user has.
However, if we have to run the api for each user, the number of api will grow when the number of okta users increases.