Added diagram metadata to PlantUML and JSON generators

src/sequence_diagram/generators/json/sequence_diagram_generator.cc

@@ -660,6 +660,8 @@ void generator::generate(std::ostream &ostr) const
         }
     }
 
+    generate_metadata(json_);
+
     ostr << json_;
 }
 } // namespace clanguml::sequence_diagram::generators::json

src/sequence_diagram/generators/plantuml/sequence_diagram_generator.cc

@@ -470,6 +470,8 @@ void generator::generate(std::ostream &ostr) const
 
     generate_plantuml_directives(ostr, m_config.puml().after);
 
+    generate_metadata(ostr);
+
     ostr << "@enduml" << std::endl;
 }