Color Restoration for B/W Documents

I have a batch of black-and-white text documents that originally featured color-coded highlights. Over time the color data was lost, so only the grayscale versions remain. Your task is to bring the highlighted text sections back to life while keeping the body text untouched and crisp... (Budget: ₹100 - ₹400 INR, Jobs: Adobe Photoshop, Graphic Design, Photoshop, Print Design)