I used a Get Metadata activity to enlist folders in a directory. I want to be able to delete all the folders enlisted .

I could reference one folder at a time with the line below:

@concat(item().source, '/', item().directory, '/', activity('Get Metadata').output.childItems[0]['name']

With the expression above, I am only able to delete one folder at each runtime. I have tried to see if things like childItems[0:1] could work but it does not. Is there a way I can reference all the folders at once so that the delete activity can delete all the folders at once?