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adding data to json-ld using angualrjs

I'm a beginner in AngularJS and I'm stuck in one of my projects. I want the data that the user enters in the form to be converted to the format:<<"schema:data">> and be pushed and displayed inside the @graph of the json-ld. this my html and angular codes:

 angular.module("watch", []) .controller("ctrl", function($scope) { $scope.output = { "@context": { "schema": "http://schema.org/" }, "@graph": [{ "@id": "person", "@type": "schema:Person", } ] } $scope.volatile = {}; $scope.output["@graph"][0]["schema:givenName"] = ""; $scope.$watch(function(scope) { return scope.volatile }, function(newValue, oldValue) { $scope.output = newValue; }); }) 
 </script> head> <title> reelyActive: Angular Test </title> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.13/angular.min.js"> </script> <script type="text/javascript" src="watch.js"> </script> <link rel="stylesheet" href="style.css" /> </head> <body ng-app="watch"> <ul> <li><a href="product.html">Product</a></li> <li><a href="place.html">Place</a></li> </ul><br/><br/> <div ng-controller="ctrl"> <form> GivenName: <input type="text" ng-model="volatile.givenName"> <br/> FamilyName: <input type="text" ng-model="volatile.familyName"> <br/> Gender: <input type="text" ng-model="volatile.gender"> <br/> Nationality: <input type="text" ng-model="volatile.nationality"> <br/> WorksFor: <input type="text" ng-model="volatile.worksFor"> <br/> JobTitle: <input type="text" ng-model="volatile.jobTitle"> <br/> Url: <input type="text" ng-model="volatile.url"> <br/> Image: <input type="text" ng-model="volatile.image"> <br/> </form> <h1> Your JSON </h1> <p> {{output}} </p> </div> </body> </html> 

$scope.output['@graph'].push({
        "@id": "person",
        "@type": "schema:Person",
        });

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