Yes, including many in this thread. External storage works fine in iPadOS with Lightning iPads, but you’ll need an adapter, with external power support too.
A good solution is Apple’s Lightning to USB 3 Camera Adapter. That provides a USB 3 port along with a Lightning power pass-through port.
My Samsung T5 SSD works fine with the above adapter, on my iPhone SE with iOS 13. (I haven't installed iPadOS 13 on my iPad Pro 10.5" yet.)
Perhaps once iOS 13 is officially released, someone will sell a Lightning flash drive that doesn't need an adapter, that works with the Files app natively. There are Lightning flash drives available right now, but they only work with their propietary apps and apparently do not work with the Files app.