API: Enroll Users in Course(s)

According to the API document post /learn/v1/enrollments, there is only one session id in payload. How to enroll user(s) in multiple ILT courses’ session?

{
  "course_ids": [
    0
  ],
  "user_ids": [
    0
  ],
  "group_ids": [
    0
  ],
  "level": "3",
  "date_begin_validity": "2026-09-14",
  "date_expire_validity": "2026-09-14",
  "session_id": 0,
  "subscription_record": 0,
  "notification_ids": [
    0
  ],
  "notification_uuids": [
    "string"
  ],
  "enrollment_fields": {},
  "consider_ef_as_optional": true,
  "branches": [
    {
      "branch_id": 0,
      "selected_status": 0
    }
  ],
  "atomic_enrollment": true,
  "assignment_type": "mandatory",
  "enrolled_at": "2026-09-14"
}