Is there a compatible eGPU for this iMac?

This question is probably not suitable for this forum (unrelated to repair) but I’ll ask it anyway because this forum is one of the more helpful forums existing.

I currently use a Mid-2010 iMac as my main machine and the graphics card is not great unfortunately. This iMac does not have a Thunderbolt port or Thunderbolt support and it appears that Thunderbolt support is necessary for eGPU support on this machine.

Does an eGPU exist for this machine? I looked on Google for a while and I had no luck finding a compatible eGPU.