How can folders visible to FIles app be created by App?

Using the Files app on iOS I can see folders created by Apps I installed from the App store.

How can I create such a folder in my app?

I can create folders in the app's bundle, I can share files into the file system where the Files app can find them. But I cannot create folders that the files app can see, or set that folder as the default place to save files

Setting Supports Document Browser and in Custom iOS Target Properties is not sufficient