You can add a custom property for a Test case and add the Test case description to this field. After this, you will be able to see the content of this property in our built-in printable reports for Test cases and projects: https://www.screencast.com/t/QBOZo4bh
But, you will need to modify each project. There is no option to change something once and apply these report settings to all project.
But, we have an open feature request about customizing Junit reports.