Each wpDiscuz user role label has its own classes. For example, in the case of the Administrators, it's a "wpd-blog-administrator"
So you can use the js code for adding the icons before and after the lable phrase.
In case you want to say thank you! 🙂 We'd really appreciate if you leave a good review on the plugin page. This is the best way to say thank you to this project and the support team.