Can Core Network know the contact list in the uSIM?

Is there a way the Core Network can know or have detailed information on the contact list in the uSIM?

I don’t think there is any protocol or message in 3GPP that supports sending this information…on Core end, there is none that I know of.
Once a session is established, Core end acts as a router, routing the Data towards Internet and vice versa.

Further, even when you send the contact list via WhatsApp or anyoner IM, it can’t be opened at Core end since it is usually encrypted.