How to use robot framework to highlight text in an image?

[mm rr]

I need to complete a task which asks me to highlight text from an image by using robot framework combine with python script, but I have no idea on how to do it. Can someone help me with this? The issue is how can I highlight some specific text in the image but not highlighting whole text in the image.

I did try to figure it out with python script and robot framework, but mine isn't really working, so I wish someone could help me. The main packages used to recognize text and highlight text are OCR and OpenCV