I'm not sure what you are asking here.
If you have two lights, with the power source in the ceiling and they are controlled by a wall switch, then you have a switch loop. A switch only interrupts power to the lights.
Now, are you thinking of adding a GFCI and a receptacle for the refrigerator to the switch, then the answer is no, unless there is a Neutral in the switch's box, you cannot extend the circuit.