How to interact with unmapped pins? PB22 PB24

Official Hardware Mega Due
1

I have the 144-pin sam3x8e Arduino Due.

Pin PB22 is the physical copper leg 141.
Pin PB24 is the physical copper leg 143.

On the page in the datasheet about multiplexing, it says:

PB22 = RTS2 = PCK0
PB24 = SCK2 = NCS2

On the page in the datasheet about IO lines, it says:

USART2 = RTS2 = PB22 = A
USART2 = SCK2 = PB24 = A

I want to use these two pins as digital output pin, i.e. I want to be able to set them either high or low. Is this possible?

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