iPadOS does not support connection of external touch-screen panels. While the monitor itself can be directly connected using HDMI or DP/HDMI Alt Mode over USB-C, the associated touch-screen functionality won't be available.
iOS/iPadOS has no facility with which to independently install device driver software.
Whether or not iPadOS will ever fully support external touch-screen monitors is known only to Apple. However, Apple do invite submission of feature requests via its Product Feedback portal. If you would like to see additional functionality in a future version of iPadOS, this would be the most appropriate channel through which to make a request:
Feedback - iPad - Apple