They've had authentic 3D stadiums for quite a while now. This is definitely in the game. There's also a thriving modding community that churns out fictional stadiums and minor league stadiums as well.
Here's a link to the modding forum:
https://www.ootpdevelopments.com/boa...lay.php?f=3879
For example, eriqjaffe has done some fantastic work on International League stadiums (AAA level) and just posted the Phillies AAA affiliate today.