how to find refered object in a jquery function

how can i get this.V2 out of the FN scope !?

$.fn.myFN = function(X){
  this.V1 = X;
  this.V2 = X+2;
};

$("#foo1").myFN(10);
$("#foo2").myFN(20);

console.log(  $("#foo2").V2  ) // this returned undefined