Hello, thank you for your replies.

At the end the engineer of the prototype board told me it's not important to have 5V (even though he stated otherwise before) so I just use regular 3.3v output as value "1" for now.

Still very useful info, thank you everyone.

Hello, I'm a long time lurker of these forums but only now decided to register to ask you this specific question: Is it possible to supply 5V with any free GPIOs on the board? Also is it possible to turn it ON/OFF with a script? I have a protoype board that needs 5V supply when the value is "1" and ...