How do you import an xPub from a Ledger Nano to a watch only Bitcoin Core

How do you import an xPub from a Ledger Nano to a watch only Bitcoin Core

I am having trouble figuring out how to import my xPub from my Ledger Nano to a watch only Full node (Bitcoin Core 0.17.1) Could someone please explain how to do this? I am reading different things. Some people say its not possible on bitcoin core and others offer confusing explainations.

http://bit.ly/2FVMxqk

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