Blackmagic eGPU

I have a LG Gram 13 inch which has a Thunderbolt 3 port.

I got a Blackmagic eGPU but it is not working in macOS 11 Big Sur.

The eGPU works fine in Windows 10 (with Bootcamp Drivers), so it's connected properly and there's nothing wrong with it.

macOS does not detect the graphics card. It does detect the USB hub though, so I can plug a mouse or a Ethernet cable into the eGPU and the accessories will work.

I really appreciate if anyone can help me.