Contact Form success message styling

I am using the Divi Contact Form module and added a bit of css to the success message for styling. I have been reading up a little on dynamic content and was hoping their might be an easy way to make the success message dynamic. Is that possible without getting the ACF plugin or do I need that to define custom fields. I was hoping I could somehow just add the Name field into the success message (so it says ‘XXX, your message is on its way!’), by referring to it in some fashion. Not sure if the name field (following the filed name for message) is called ‘et-pb-contact-name’ and if it is, is there a way I can define it in the message here (by affixing a @ or # or some other special character to it to make Divi realize it is a dynamic field or if there is some way to add this in the CSS code?
Or do I need to get the ACF plugin to do something like this? I am new to Divi and how it uses dynamic content and check the posts within and saw a lot of references to ACF, but again wondering if that is required for this simple application? Thanks.