It's very common. PaddleOCR is enough to get extremely well-done bounding boxes, and it runs very fast on a $150.00 GPU.
There's always room for improvement, though. I suspect a tool will emerge for highly detailed OCR that implements a nested bounding-box-based multi-scale approach, effectively OCRing small sections at a time and then gradually compiling them by expanding the surface area using the bounding boxes.
I've thought a lot about implementing it anyway.
edit: I see you're asking about the block labels. Leaving the comment in case someone finds it interesting.
There's always room for improvement, though. I suspect a tool will emerge for highly detailed OCR that implements a nested bounding-box-based multi-scale approach, effectively OCRing small sections at a time and then gradually compiling them by expanding the surface area using the bounding boxes.
I've thought a lot about implementing it anyway.
edit: I see you're asking about the block labels. Leaving the comment in case someone finds it interesting.