Is it okay if the OCR text is not captured?
OCR engines sometimes do not capture all of the text. It is a common occurrence to see that some text may not get captured when you draw bounding boxes. Don't fret, just draw the box and label it correctly.
Why wasn't the text captured?
The OCR engine may miss text for multiple reasons -
1. Image Quality not being great
2. Text size being small
3. Text being blurry
4. Text is handwritten
5. Text is written in an unrecognisable font
Should I manually enter the text?
No, you don't have to manually enter the text. Just drawing the box and leaving it as is completely fine.