Change analog ref using AREF on Arduino nano 33 BLE

I need to change the analog reference of the Arduino ADC to improve the sensibility of the measures I can do for a project without amplifying the signal. The Arduino has an AREF pin to do so, however in the code of the AnalogReference() function there's no posibility to use it as a reference. If I type AnalogReference(EXTERNAL), the code does not compile. The macro EXTERNAL does not exist for this board, so I can't use an external reference for the ADC.

I don't know if someone knows how to do it.
Thank you so much.

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