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If you mean "can I get an idea of the traffic on my local network that goes on the Internet to some external site", yes, you can, and, if capturing your local traffic is legal, capturing that traffic is legal, too.
If you mean "can I get an idea of all the traffic, from everywhere on the Internet, that goes to some external site", no, you can't, unless you're running Wireshark on that site's networks.
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