With the USB-C PD Sink board, it is possible to power every RPi (except the RPi 400) with a USB PD power supply. The board is set to 5V (switch S1 on pos 0) and 3A (switch S2 on pos 2) and connected to the RPi 40 pin HAT connector through a 2-pin header. On this header pin 4 for +5V and pin 6 for ground is used. 

A detail picture of the connector. The red and black wire to the right are the power supply. For reference, the red and black to the left are the fan of the enclosure.

And for more reference, here is a generic HAT header pinout (courtesy RPi foundation website).

A word of caution: connecting power to the wrong pins or having the PD board set to a voltage higher than 5V will cause permanent damage to the RPi. Only try this at home when you know what you are doing. And then do it right. Check and check again, and check on more time.

And don't mind the UMC connection on the RPi, that is a story for a different time.