Here some example for String Interpolate
Javascript Code:
var appmoduel=angular.module('moduleName',[]);
appmoduel.controller('controllerName',['$scope','$interpolate',function($scope,$interpolate)
{
$scope.valuetext = 'click me';
var html = '
{{valuetext}}
';
$scope.interpolate = $interpolate(html)($scope);
}]);
HTML File:

Result
click me