There was a hint of this in Meeting Like This, when Leia meets Ghost!Jango in the force cave Jango says that there’s a question Boba is always asking and that the answer is “every day.” In the following chapter, Leia asks Boba if he ever feels like his dad is watching him from the afterlife and Boba says “every day.”
So I think the one thing Boba would want to say to Jango would be something along the lines of “did you see that, Dad?”