Sameer,
Please report your feature requests in the Innovation Zone.
If you report your entry here, others that see value in this can 'upvote' the request to give it more attention/weight in the evaluation process of which features to implement.
But in this case, I see the NAS Name as an available option, which is the network device name:

I'm on ClearPass 6.12, so if you are on 6.11 it may be that it was added in 6.12.
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Herman Robers
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If you have urgent issues, always contact your HPE Aruba Networking partner, distributor, or Aruba TAC Support. Check
https://www.arubanetworks.com/support-services/contact-support/ for how to contact HPE Aruba Networking TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or HPE Aruba Networking.
In case your problem is solved, please invest the time to post a follow-up with the information on how you solved it. Others can benefit from that.
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