If you say ‘Thunderbolt GPU’, it makes it sound like a PCIe device with a Thunderbolt output. Rather than go in this direction, ASRock
ASRock Radeon RX7600 Challenger 8G OC GDDR6 128-BIT Graphics Card - Syntech
External Graphics Card ASRock DeskMini a300 - m.2 eGPU RX590 1080 Ultra Gaming Test
ASRock's Internal External GPU: No Box Needed
ASRock B650I Lightning WiFi
ASRock's Internal External GPU: No Box Needed
How to choose the right motherboard for your PC in 2023
Asrock introduced some new motherboard with internal display output (eDP) for people who put a LCD display inside their PC glass panel, so that you don't have to wrap your display cable
ASRock RX570TM-ITX TBT is a Thunderbolt External GPU with Copious Amounts of Downstream I/O
New eGPU setup. ONEXPLAYER handheld pc + RTX 2070 = Gaming Bliss : r/eGPU