glance/api-ref/source/v2/samples/task-create-request.json

{
    "type": "import",
    "input": {
        "import_from": "http://app-catalog.openstack.example.org/groovy-image",
        "import_from_format": "qcow2",
        "image_properties": {
            "disk_format": "vhd",
            "container_format": "ovf"
        }
    }
}