iPad 8th Gen. How connect Behringer UMD202HD - USB Audio Interface, when CCK does not suppy enough power

Are you certain that this device is even compatible with your iPad?

Many USB devices intended for PC and Mac require installation of device driver software; unless there is a companion App that incorporates required device drivers, you cannot add device drivers to iOS/iPadOS devices.

You need a powered USB HUB. one that has its now power supply so it can power connected devices.

For example: Link-> Powered USB Hub 3.0, atolla USB Hub with 4 USB 3.0 Data Ports and 1 USB Smart Charging Port, USB Splitter with Individual Power Switches and 5V/3A Power Adapter - Amazon.com