I have a 2021 Ram 1500 and I'm trying to figure this out as well but for a different reason. I couldn't fit my truck in the garage with the original sharkfin antenna. I replaced it with a smaller "puck" style and then just plugged the original antenna into the connection at the passenger kick panel and moved it under the dash. I've researched the cables as well and did find this older publication that may help you. Some of these part numbers are available online:
Here's the specific jumper I'm looking at:
2013-2021 Ram part # 68148258AD - GPS Navigation System Antenna Cable
I am actually trying to find a jumper for the white cable that accompanies the blue one in my stock antenna. In my truck, the bluce connector plugs back in at the kick panel but the white connector will not. The male / female ends appear slightly different. The cable I'm referring to is attached.
Good luck. Let me know what you come up with and if you happen to have an idea on this white cable.