I've used my old multimeter from the '90s to make those measurements. These might not be 100% accurate but are quite close. I used in my left hand a red probe and a black probe in my right hand. I've used a diode/continuity model on the meter. Here are my findings.

 

Xbox One X - from the left red probe to right black probe:

1 to 2: OL
2 to 3: OL
3 to 4: 593mV
4 to 5:  559mV
5 to 6: OL
6 to 7: OL
7 to 8: OL
8 to 9: OL - to the ground
9 to 10: 657mV
10 to 11: OL
11 to 12: OL
12 to 13: 618mv
13 to 14: OL
14 to 15: OL
15 to 16: 647mv
16 to 17: OL
17 to 18: OL
18 to 19: 655mV

PS5 - from the left red probe to right black probe:

1 to 2: OL
2 to 3: 737mv
3 to 4: OL
4 to 5:  OL
5 to 6: 737mV
6 to 7: OL
7 to 8: OL
8 to 9: 737mv
9 to 10: OL
10 to 11: OL
11 to 12: 736mv
12 to 13: 624mv
13 to 14: OL
14 to 15: OL
15 to 16: 1386mv
16 to 17: OL
17 to 18: 480mv
18 to 19: OL

HDMI Xbox Series S - from the left red probe to right black probe:

1 to 2: OL
2 to 3: 709mv
3 to 4: OL
4 to 5:  OL
5 to 6: 709mV
6 to 7: OL
7 to 8: OL
8 to 9: 704mv
9 to 10: OL
10 to 11: OL
11 to 12: 708mv
12 to 13: 668mv
13 to 14: OL
14 to 15: OL
15 to 16: 1420mv
16 to 17: OL
17 to 18: 580mv
18 to 19: OL

HDMI Xbox Series X - from the left red probe to right black probe:

1 to 2: OL
2 to 3: 702mV
3 to 4: OL
4 to 5:  OL
5 to 6: 704mV 
6 to 7: OL
7 to 8: OL
8 to 9: 705mV
9 to 10: OL
10 to 11: OL
11 to 12: 706mv
12 to 13: OL
13 to 14: OL
14 to 15: OL
15 to 16: 1452mV or 568mV - not sure which one is correct.
16 to 17: OL
17 to 18: 572mV
18 to 19: OL

Each time I'm fixing some game console, I'll try to add or update this list.

Thank you,
Peter,
Piotr Ficner.