Searching and Filtering Objects by Metadata

You can use $select. See "About query parameters" in iControl REST User Guide Version 13.1 (pp. 28-29).

For example, GET /mgmt/tm/sys/version (equivalent to tmsh show sys version) returns Build, Edition, Product, Title and Version. When you add the query string $select=Edition, the call returns only the Edition field (and its parents). e.g.,

 curl -sku : https://localhost/mgmt/tm/sys/version?\$select=Edition | python -m json.tool
{
    "entries": {
        "https://localhost/mgmt/tm/sys/version/0": {
            "nestedStats": {
                "entries": {
                    "Edition": {
                        "description": "Point Release 7"
                    }
                }
            }
        }
    }
}

The above is from LTM but it should also work on GTM/DNS.