The thing that makes it "hard" is that it's all indirect. You compile a program for the GPU (a shader). Then you have to setup data (textures and buffers) for it. Then, you need to spend a bunch of time telling the GPU how to use that data, offsets where each piece of data is, what formats the data is in,, how to advance to the next piece of data, etc.. etc..

There are a few libraries that try to abstract over all this indirection but all the graphics APIs themselves are lower-level so you're left to do all of that yourself.

https://docs.swmansion.com/TypeGPU/

https://github.com/google/toucan