There was one offering long back called Mendix AQM i am not sure if that can be directly used in the Mendix Studio/Pro but it was a cloud solution to which you can submit your mendix app and seek for a really extensive report. It included detailed reports on both mendix objects as well as Java files. I dont exactly remember if it included report on Styling!
So to use the AQM i think you had to seek a mendix vendor as far as i remember (back when my team did it, it was under mendix itself.)
It is based on the principles defined by SIG (Software Improvement Group)
Hope this helped you in some way :)
You could also check out ACR, from CLEVR. https://www.clevr.com/solutions/developer-suite/application-code-reviewer.
It basically scans your code against 150+ best/good practices, possible bugs, Java vulnerabilities, etc. It's most easy to use to check your code after committing, but it's also possible to do it beforehand.