convert .json to coco

[Warday]

I have created a segmentation dataset in BreinBuldier and it let me convert it in three forms, Tensorflow, caffee and Json. To use it with maskrcnn I need the dataset in .json but with coco format. Frequently asked questions sad that I can easily change the format of the .json file to coco with some code, but they dont give it and i can't find it anywhere. The .json file is here Full problem or more detailed here Please I don't want to start again, there are more than 1000 leaves.