Just looked into the specific m.2 wifi card you mentioned and there’s definitely antenna connectors on it. You’ll want to get something like an ** ipex4 to sma** cable that you will plug into the m.2 wifi card on the Main and Aux ports and then thread the screw on ends into those holes you mentioned. You’ll then need an antenna that can connect to the screw on portion. This should greatly increase your wifi performance since right now your case is acting as a shield and blocking a bunch of the signal.
It’s likely you can get the cables and antenna in one package. Your card has 2x2 mimo antenna type fyi.