I also connected GoPlus 2 to M5 Basic.
Next, I connected Relay Units to PortB_1 and PortB_2 respectively and confirmed the operation.
UIFlow Block is based on the image posted by ajb2k3_san.
I didn't have to use a block of Relay Units.
Posts made by Rokuemon
RE: [UIFlow] PaHub and PbHub support in UIFlow for M5 Atom, Matrix, Ink, StickC and StickC Plus
I am suffering from a similar problem.
I tried to use Pa.HUB to use two Light sensors in addition to the M5 Stick C + UIflow.
However, even if unit can be selected, HUB does not appear in the menu for selecting Port.
Please let me know if there is a solution.