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How to dynamically map over object

I need to dynamically insert a list of values as the key to be mapped over. The list here is employeeTypes. I need to map() over every role.supervisors and every role.employees..

Attempt:

export default function EmployeesByDepartmentList({ department }) {
  const employeeTypes = ["supervisors", "employees"];

  return (
    <div className={styles.departmentSection} key={department.id}>
      {department.roles.length
        ? department.roles.map((role) =>

            employeeTypes.forEach((type) => { // this is my attempt at iterating over each item in employeeTypes to use as the role key

                role[type].map((item) => (

                  <ListLinkItem
                    key={item.id}
                    id={item.id}
                    href={`employees/${item.id}/`}
                  >
                    <EmployeeImage
                      src={item.image}
                      alt={item.first_name + item.last_name}
                    />
                  </ListLinkItem>
                ));
              })
        )
        : null}
    </div>
  );
}

I am sure it is easy, I just can't seem to visualize what I need atm. All help appreciated!

Edit:

This is the department object:

{
    "id": 2,
    "roles": [
        {
            "id": 1,
            "employees": [],
            "supervisors": [
                {
                    "id": 8,
                    "role": "Casino Supervisor",
                    "last_login": "2022-05-06T13:34:44.934187-07:00",
                    "is_superuser": false,
                    "username": "T2Admin1",
                    "is_staff": true,
                    "is_active": true,
                    "date_joined": "2022-04-06T19:42:22-07:00",
                    "first_name": "T2Admin",
                    "last_name": "Admin1",
                    "badge_num": "1234",
                    "email_notifications": true,
                    "sms_notifications": true,
                    "points": 0,
                    "image": "/media/images/profile_pics/dealer.jpg",
                    "supervisor": null,
                    "company": 2,
                    "groups": [
                        1,
                        3
                    ],
                    "user_permissions": []
                },
            ],
            "name": "Casino Supervisor",
            "supervisor": null,
            "group": 1,
            "company": 2
        },
        {
            "id": 11,
            "employees": [
                {
                    "id": 4,
                    "role": "Dealer",
                    "last_login": null,
                    "is_superuser": false,
                    "username": "T2Dealer2",
                    "is_staff": false,
                    "is_active": true,
                    "date_joined": "2022-04-06T19:32:08-07:00",
                    "first_name": "T2Dealer",
                    "last_name": "Dealer2",
                    "badge_num": "1234",
                    "email_notifications": true,
                    "sms_notifications": true,
                    "points": 0,
                    "image": "/media/images/profile_pics/dealer.jpg",
                    "supervisor": null,
                    "company": 2,
                    "groups": [
                        2
                    ],
                    "user_permissions": []
                },
            ],
            "supervisors": [],
            "name": "Dealer",
            "supervisor": null,
            "group": 2,
            "company": 2
        }
    ],
    "created_on": "2022-04-14T16:15:27.299700-07:00",
    "updated_on": "2022-04-21T12:31:24.773872-07:00",
    "name": "Casino"
}
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