Yes, sorry, gonna mark that issue as solved.
For the record, here what I understood, hope it's correct:
I figured out there is, at least right now, no "crosswalk" for iOS. One of the major purpose of crosswalk is to add a level between the app and the browser of the device to unify to behavior of the app over different kind of android device. This isn't necessary on iOS device.
However, I read somewhere that there is a crosswalk support for iOS but these kind of app where at least right now, not accepted by the apple store.
On the other side, I also asked my self about iOS, because crosswalk enhance the performance of the app on android device. I figured out that this could be (maybe) achieved on iOS 8 and 9 device using the WKWebView (introduced in iOS8). I tried therefor the WKWebView cordova plugin and faced CORS problem, that's why i opened a new task.