I installed UIFlow_Core2 version v1.7.1_core2 on my Core2 and now I have no power on port A.
If I add "power.setBusPowerMode(0)" in the Python tab before any Units are initialized the power is returned but I can not do this with blocks.
The power is restored until the Core2 is reset.
Thanks for the code @felmue!
I have updated my Servo2 custom block with a new "Servo2 enable external power" block... and it can be found here: https://gitlab.com/ove.risberg/uiflowblockservo2
I could not find any support for Servo2 module in UIFlow so I created a Custom UIFlow module
https://gitlab.com/ove.risberg/uiflowblockservo2
This module was created for Core2 but if the i2c pins are modified it should also work on older Cores.
I hope to make this configuration automatic in future versions of Servo2.m5b