Process element to display a warning message

Hello All,

I am trying to displaying a  warning message in the middle of the business process. Based on the input provided in the warning message, the process would diverge into two sub process. I know that we can add the warning message in the client side code but I need the warning message in between the process, Is there any process element which can be used to display a warning message? Please let me know how to approach this case.

Please refer to any example business process in the base configuration that covers the above scenario.

Thanks,