I suspect you've had it I'm afraid.
Child count .... 0. Very few extended properties. Looks like it's just a plain old image file. Not sure if the grid properties will be stored in another object somewhere (devs could probably tell you that) else, in which case you may get lucky. But if they draw it all to a canvas, and then present the canvas to the front end as a single image, I doubt you'll get anything else useful from it as an object.
You could probably do something clever with image finding for the checkboxes and OCR for the text. But better so see if the grid is stored elsewhere first.