"Questions" Pop-up, when ordering add-ons?

Could we add a pop-up, if a client adds an add-on that triggers a question?

If someone orders virtual staging, and I have it set at $0.. they then answer a question at the end of the ordering process.

Could we make it where the question either pops-up immediately for answering, or at least notifies the client “You will need to answer a question at the end of the ordering process, to determine the final amount charged for this add-on.”

Just that would perhaps clear up confusion, while there is no option for entering multiple numbers for add-ons!