Question about ASUS ROG Flow X13

Correction:
Only the eGPU special solution from Asus works with this notebook:
https://rog.asus.com/us...

In contrast to conventional Thunderbolt eGPU solutions with a PC graphics card, Asus uses a mobile graphics card that is connected via PCIe x8 instead of PCIe x4.

Thank you! Poha, I didn't think it was so expensive on its own :/

There are these eGPU cases in which you can install a graphics card. Of course, they also come complete with a graphics card, but it seems that nothing is available at the moment.
https://www.digitec.ch/search
Gigabyte Aorus GeForce RTX 2070 Gaming Box (External)