You should move this question to Products . Marketing Central is for generic marketing questions and you would be much more likely to get an answer.
And to answer your question, this is absolutely not possible with Marketo Lead Management. It can be possible with Web Personalisation a (chargeable) Marketo add-on app. With MLM, the only approaching way of doing this would be with an iframe embedding a Marketo landing page that you could make even dynamic.
Depends on what is meant by "Smart CTA," Greg. Without elaboration, how do we know Clemente doesn't mean "embeddable button" -- i.e. Mkto form would work fine?