There is 1 option, and that would be to remove the internal wifi card and use that slot to connect the eGPU.
Though that means you will have a cable that is connected to the bottom of the laptop at all time. Well at least when you would want to use the eGPU. Not very portable.
Second thing, you would have to invest in: a GPU, PSU, mPCIe eGPU adapter and case to put all this in(guess this is optional). Aw and also an external wifi adapter, since you will be removing the internal one.