Blockstream does have it now. But I don't think Nunchuk does.
Nunchuk does support watch-only. You only need to pair a hardware signer with the app to make it watch-only.
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Can a watch-only wallet be set up for other hot wallets though?
Sure, you just need to export/import the wallet descriptors or BSMS file into Nunchuk (Nunchuk is built on open BIP standards).
