Creating IoT Wireless downlinks with Boto3

I might be missing something here, but I'd like to use Boto3 to create and queue downlink messages to LoRa devices. However, the docs only appear to support delete_queued_messages() and list_queued_messages().

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/iotwireless.html

Does boto3 really only support listing and deleting downlinks? Is there no way to create?