Get domain-name-servers for a network [ Edited ]

[#1]

 use the following curl to see the options for a network

curl -k -u USER -X GET "https://infoblox/wapi/v2.9.5/network?network=10.10.10.10/27&_return_fields=options"

I get the following output and I can see the "domain-name-servers"

[
    {
        "options": [
            {
                "name": "domain-name-servers", 
                "num": 6, 
                "use_option": true, 
                "value": "11.11.11.11", 
                "vendor_class": "DHCP"
            }
        ]
    }
]

But for some network's "domain-name-servers" dont show up

When checking the WebUI I see this

I see the DNS servers under options but they are greyed out and it stated that they are "inherited from grid infoblox"

So how can I use the API to get these values?

[#2]

As far as I know, this cannot be done, even if you call the fileop object to export the CSV, it still does not show the inherited DHCP options.