Creating SBD dataset from polygon information

[ogail]

Hi,
I want to conduct MNC training on my own dataset, however the object boundaries ground truth information I have is in polygon points + class format like this: {class: "pen", "polygon": [(x1,y1), (x2,y2),(x3,y3),(x4,y4)]}. I'd appreciate if anyone is aware of an existing code or an easy way to convert this into SBD format. Note that closest thing I found was converting SpaceNet getJson labels to Pascal VOC labels (however, this requires converting what I have to getJson labels, which is still not as straightforward).

Any help/tips on a way to easily convert polygons/class to SBD would be appreciate.