Action center

Go to Settings / System / Notifications & Actions

Then Quick Actions / Choose your Quick Actions

There you can assign the cellular data toggle button. Tap on the one you want to change. It'll bring up a list of assignable Quick Actions.
 
Cell/Mobile Data is not available as an action in notifications. It is not "user-creatable" . . .
 
It might actually be carrier specific, but I whipped up a quick video for ya...

 

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