如何创建/使用共享应用程序组容器作为包含应用程序及其在ios中的扩展名之间的缓存存储

Data sharing between app and its extension occurs through common AppGroup. I can use shared app group container as persistant data/file storage. How can I create/use shared app group container as cache storage between a containing app and its extension? Is this even possible?Data sharing between app and its extension occu