Hi,
If it’s a Non-XInput supported device then you might be able to set it up using the Windows RawInput plugin provided by Epic. You can find this plugin in Settings > Plugins > Input Devices. Once you activate it and restart your project, you will see a new set of input keys being available to you under the category GenericUSBController. You will probably need to try them one by one to find out to which your device’s keys are mapped to.
Hope this helps.