You can use external GPUs on the Raspberry Pi 5

Unscrew the bracket and slide it out of the dock 5 Press the release button at the PCI slot and remove the graphics card from the unit

Supports up to 2 Slot Graphics Cards; Up to 87W USB-C Power Delivery*; 5 x USB Ports 5Gbps; RJ45 Gigabit Ethernet Port

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totalpetir slot graphics card in a PCIe slot, they've merged the GPU and the TB3 controller onto one board That's been done before, though, so I'm not sure