organizing my own data in format of SA1BRawDataset dataset

Hi, i am trying to fine tune sam2 for my own dataset. Initially, i have tried writing my own class but i have to change many transform functions because they have been written for video data. Now i want to organize my data the way SA1B data is organized so that i can use `SA1BRawDataset` class. I want to know how can i organize my data in format of SA1B data? SA1B data is very large so i am unable to download it and i am not sure how it is structured. For my data, I have images and binary segmentations.