I've not found one either. I did this at a very large scale recently and ended up just using pdfplumber. I did POC Table Transformer but the cost was too high at my scale--there are probably better options now anyway. Most seem to focus on structure detection and then use traditional OCR for the actual content extraction.

It's a very hard space in the long tail, like tables that span pages or tables with complex internal structures. I went into it thinking "eh how hard can tables be?". Very hard. Thankfully it's a pretty active research area.

If you're looking for better accuracy and table layout preservation, give LLMWhisperer and Docling a try! Both keep tables tidy with a Markdown-like structure.