Get Version Information

Is there a built in way in forms to get version information of the app? Or do we have to implement this ourselves?

For iOS:
var ver = NSBundle.MainBundle.InfoDictionary["CFBundleVersion"];

For Android:
var appVersion = String.Format("{0}.{1}", PackageManager.GetPackageInfo(PackageName, 0).VersionName, PackageManager.GetPackageInfo(PackageName, 0).VersionCode);