Moot question. Laptops as a general rule CAN NOT have graphic cards added to them.
In fact, I can't remember *ANY* laptop with a PCI-E slot at all - even ones with the ancient "ISA" slots were extremely rare, and the whole concept seems to have died before AGP got widespread (PCMCIA took over, then even that idea mostly died as more stuff got integrated).
History is repeating. Right now there are at least 3 turnkey solutions for external GPU(s) for laptops:
-Razer Core - thunderbolt 3
-Alienware (Dell) Graphics Amplifier - proprietary port
-MSI Gaming Dock - proprietary port
Not reasonable priced, but concept of having mobility and power as needed could lead to some market successful solutions in the future.