Per the FSM, each sensor gets a separate wire from the PCM for the heaters, and for the sensors (8 different wires). The heater pairs go to ground on common wires. The sensor grounds go back in pairs to the PCM on 2 wires.
FSM pages 8W-30-20 and 8W-30-21. https://wranglertjforum.com/attachments/2006-tj-service-manual-pdf.14047/
I was looking at that I’d started with ground wires noting some non Jeep vehicles had a common ground terminal block for the O2, on the 2006 Jeep locations were all listed as different one on the front exhaust pipe one was listed at the rear of the main cat the other two were at other different locations power and signal would obviously terminate at the PCM, I would think anyway but haven’t read that far into the diagram yet. I also started checking voltages at the 1/1 sensor this was where it all began the voltages varied from mili volts to 4.5 - 5v but I was unfamiliar enough with what I was looking for specifically on each wire I set that aside for later to research more.