Pop-up Messages after a Request is submitted

Description - I would like to request a way to create a custom pop-up message for different requests that come in through the request queue.

Why is this feature important to you - We have a few different request queues with different timelines. We would love for a custom pop-up message to notify the requester of the timeline for that specific request form.

How would you like the feature to work - Once the requested presses the submit button and pop-up message would appear with a customized message for that specific custom form. It could possibly mirror the pop up messages for proof that exists today.

Current Behaviour - Currently there is no pop-up message for requests.