It’s a good question, I’d also like to know the correct answer.
If you build for “DesktopGL” which uses the OpenGL render backend, the user at least needs support for OpenGL 2.0, but I don’t know if the user needs to install anything?
I found this post about OpenGL
OpenGL prerequisites
If you build for Desktop DirectX, I’m pretty sure the user needs to have a specific version of DirectX installed.
I hope someone more knowledgeable will chip in 