neutron-lib/api-ref/source/v2/samples/subnets/subnetpool-create-request.json

{
    "subnetpool": {
        "name": "my-subnet-pool",
        "prefixes": [
            "192.168.0.0/16",
            "10.10.0.0/21"
        ],
        "default_prefixlen": 25,
        "min_prefixlen": 24,
        "max_prefixlen": 30,
        "shared": "false"
    }
}