Configure Dynamic Live CTA in Adobe Campaign

Hey Team,

I'm looking to set up a campaign in Adobe Campaign Classic with an email design that includes a dynamic Call to Action (CTA) button displaying the number of customers who have already joined the journey. For instance, when a customer receives the email and clicks on the CTA, it should show a message like "You are the 56th customer out of 850 who have joined." Could someone provide guidance on how to configure this in the Adobe Campaign Classic console?

Appreciating quicker support on this.

Thanks!