The ends are proprietary, but the cable is just normal cat 6. Can splice cat 6 cable in the middle if you are comfortable doing that. Best bet is to use female to female couplers:
https://www.amazon.com/Coupler-Ethernet-Extender-Adapter-Female/dp/B07WR1N7FX
Will need a punch down tool and some rj45 connectors:
https://www.amazon.com/JIGUOOR-Maintenance-Punchdown-Connectors-Stripping/dp/B08L6DK6PG
Then watch a couple of YouTube videos, search for “rj45 crimping tutorial”. Here’s one to get you started: