var func1 = function(){
  return new promise(function(resolve, reject){
    //some operations here
  });
};

var func2 = function(){
  promise.resolve(someFuncSync())
    .then(function(){
    //this is the old promise chain

        func1()
          .then(function(message,error){
             return message;
             //i want use this return value in old promise chain
          });

         console.log(message);
        //printing  func1 returned message in old promise chain
    })
};