How can I implement an if-else condition in a XML-View in SAPUI5 that uses a flag (condition) from a JSONModel?

So far I have a Controller:

sap.ui.define([

    sap/ui/core/mvc/Controller,

    sap/ui/model/json/JSONModel

], function (Controller, JSONModel) {

    use strict;



    return Controller.extend(sap.ui.demo.myApp.myController, {

        onInit: function () {

            //// set data model on view

            var oData = {

                title: A cool title,

                values: [{name: Text 1, marketed: true}, {name: Text 2, marketed: false}, {name: Text 3, , marketed: true}]

            };



            var oModel = new JSONModel(oData);

            this.getView().setModel(oModel);

        }

    });

});

and a View:

<mvc:View

    controllerName=sap.ui.demo.myApp.myController

    xmlns=sap.m>



    <!-- using aggregation binding -->

    <Panel expandable=true expanded=true headerText={/title} width=100% content={/values}>

        <content>

            <Label text={name}/>

            <!-- if {marketed} 

                    <Label text=product is marketed/> 

                 else 

                    add nothing

            -->

        </content>

    </Panel>



</mvc:View>

Edit:

Is there a better way to do it than by implementing an overkill-feeling XML-Preprocessor?