When an NFT is staked to a NaaS subscription, you will see the NFT indicator on that NaaS subscription in both the "My NaaS" and "All NaaS" tabs. It doesn't matter if that is NaaS subscription is in your wallet or someone else's wallet, the small “NFT” indicator will show up for that NaaS subscription.
Hovering on that indicator, you will see the NFT type and number.