How would I create a ListView displaying the subdirectories of a FireBase database?

I'm trying to list the names of every folder in my Firebase database.

My folder structure looks something like this:

folder_of_users-
    user1 - 
        "name": "bob",
        "occupation": "emperor"
    user2 - 
        "name": "jennifer",
        "occupation": "surgeon"
    user3 - 
        "name": "jason"
        "occupation": "butler for emperor"

I want to make a ListView displaying user1, user2, and user3, but I'm not sure how to do that. Sorry if this is a silly question!

Edit: To be clear, I'm using FireBase's Realtime database, and I'm using Flutter. I'm trying to show the actual names of the folders, so in my example:

user1
user2
user3

Not, the actual contents of which. Again, sorry for any misconceptions, or if this is a dumb question!