Can AREF pin be used as an input?

Official Hardware MKR Family MKR WAN 1310
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Looking at the pinout I see that the AREF pin is called "AREF / AIN[1]".
It's not a digital pin, analog only according to the pinout, right?
Can I use it to measure some analog voltage? And if so, what is the pin number/name I need to pass to analogRead() ?

Thanks

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I'm also wondering what the PA30 and PA31 solder pins at the bottom of the arduino are for? Can I use these as two as two additional GPIO pins?

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AREF can be used as an external voltage reference for the ADC.

See the processor data sheet for the details, and the Arduino analogReference() documentation.

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Its not an analog input, its for a voltage that will be used as a reference by the ADC.

Its possible to work out what that voltage is - so yes you can measure it; but its not as easy as reading an analog input.

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