Load Cheat engine plugin
Open Cheat engine before the game
Open LOL Client
Thats it



Credits to @wakon5544 for his Plugin: Cheat Engine UD Plugin For (League Of Legends new AC)

To use it just click on Edit -> Settings -> Plugins and add the .dll.
Make sure the Checkbox for the Plugin is checked.
After that start League of Legends and attach CE to the game.