Is there a way where I can store expression such as {{item.hello}} directly to a localstorage?
You can try :
To set item on local storage
window.localStorage.setItem('hello', 'Just say Hi! with a smile.');
To get item from local storage
window.localStorage.getItem('hello');
If you want to use it in your html view you need to do :
In your controller (.js)
$scope.hello = window.localStorage.getItem('hello');
In your view (.html)
{{hello}}