Hi Sethil,
Have you tried loading a second model (datasource) and set to the view. Something like this:
var oModel = new sap.ui.model.json.JSONModel("test-resources/sap/ui/demokit/explored/products.json");
this.getView().setModel(oModel,"firstmodel");
var oModel2 = new sap.ui.model.json.JSONModel("whatever url to your second data");
this.getView().setModel(oModel2,"secondmodel");
And then have your controls binding to the source of your choice like this:
text="{firstmodel>/ProductId}"
regards
Sven