I am unfamiliar with latest blogger theme, I want to create own template and markups. Do you know unpublished data tags in latest blogger template (Contempo, Soho, Emporio)?
Currently, there is no official documentation for the new themes launched by Blogger.
Instead, I would suggest referring to http://template-data.blogspot.com/ and https://so-how-do-i.blogspot.com/. Both these blogs are maintained by a Blogger Engineering team member (Luke Bjerring) and contain quite a lot of information regarding the new themes code