This package seems to use llama_cpp for local inference [1] so you can probably use anything supported by that [2]. However, I think it's just passing OCR output for correction - the language model doesn't actually see the original image.
That said, there are some large language models you can run locally which accept image input. Phi-3-Vision [3], LLaVA [4], MiniCPM-V [5], etc.