How can I Create a shortcode for "Site Tittle"?

Hi there heroes!

In our WPMU, users can create new Blogs. When they create a new Blog there's a page created automatically for their own Privacy Policy already written.

I'd like to place a shortcode for "My-Site" so each Blog can have this text replaced by their own name (Blog Tittle).

Maybe you could provide me some lights on how to achieve this. Thank's! :beer: