It seems not to be possible to add List to the QueueItem, but all types are available when providing the collection for the QueueItem. Or is it possible and I just missed something?
This is what I get when trying to push the new QueueItem to Orchestrator:
"message": "Add queue item : The given untyped value '[\"801805281\",\"801804747\"]' in payload is invalid. Consider using a OData type annotation explicitly. Error code: 0"