Creates up to 100 empty candidate lists in the caller's organization in one request. Each item takes the same fields as creating a single list. The request is rejected with 400, and nothing is created, when the body is invalid, it holds more than 100 lists, or two lists share an externalId. Otherwise each list succeeds or fails on its own, and results reports every list by its index in the request. A list naming an unknown owner or team fails without affecting the others. A list whose externalId is already held by a list in the organization is not created again: it is reported as existing with that list's id, and the existing list is left unchanged, so a batch can be retried safely.