GPU Column not showing in task manager

If your driver has WDDM support as @tjnihal said you can add column from registry editor.
open run window and type regedit and go to this location.
Computer\HKEY_LOCAL_MACHINES\SYSTEM\CurrentControlSet\Control\GraphicsDrivers and make new DWORD(32-bit) Value and name TdrDelay. then right click on this and modify. choose decimal Base and enter 60 in Value data and click OK and check task manager