Here are the steps:

• Import https://github.com/quarkusio/quarkus-quickstarts/tree/main/qute-quickstart into the workspace
• Restart the workspace (because of JBIDE-28438)
• Open the src/main/resources/templates/hello.html template
• When the codelens is displayed, link on the name : String part
• That should open the Java file on the method that sets the name parameter for the template