Tl:dw Hubble is designed to look at objects really far away and isn’t calibrated for Earth or fast enough to track a single spot long enough for good exposure, so the earth would be blurry.
Hubble is old enough that it only has a 1MP camera, so roughly 720p or 1280x720 pixels , so each pixel would represent about 15 feet if you’re generous. A back yard swimming pool would be like 4 pixels, 9 if your parents are rich.