Getting title of document via VNRecognizedTextObservation

I am reading the image text from Vision kit (OCR) capabilities and trying to find out the title of the document. This seems pretty obvious in case if Title is on the top of the Document. But in some cases, for example, if I am reading a Business card, etc, sometimes appears somewhere in the middle of the card. While debugging, I found that there is an isTtile field (screenshot attached) VNRecognizedTextObservation. but I am not able to access it? is this private? Although I don't see a clear reason to have this property to be private.