Do you have xposed installer? If not then download xposed installer and then open the app and go to downloads and search for Advanced Power Menu and download it. Then go to the xposed app you previously downloaded and go to the Modules section and check the box next to Advanced Power Menu. Then open the Advanced Power Menu via xposed and edit the settings you want and dont want, and Mobile Data toggle is one of those settings you can add. After you change the settings you need to reboot your phone normally, and after reboot you should be able to hold down your power button and have a few more options on the menu. Hope this helps!