annotations.json

{
    "images": [
        {
            "id": 1,
            "file_name": "image_001.jpg",
            "height": 640,
            "width": 480
        }
    ],
    "annotations": [
        {
            "id": 1,
            "image_id": 1,
            "category_id": 1,
            "bbox": [50, 60, 100, 120],
            "area": 12000,
            "segmentation": [],
            "iscrowd": 0
        }
    ],
    "categories": [
        {
            "id": 1,
            "name": "cell"
        }
    ]
}