Sadly such a footprint is missing in the official lib. (We only have TO-220 footprints for packages without a Tap.)
Depends on your mosfet.
If the Tap is connected to one of the other 3 pins you can just give this pad the same pin number as the pin it is connected to.
Otherwise you need to give it a separate pin number
Have a look at
TO_SOT_Packages_SMD:TO-252-3_TabPin2 for inspiration. (Yes this is a SMD package but it shows the principle of how it can be done.)