[logback-dev] Print literal curly bracket

Hi How to print the curly bracket } in the SuffixPattern of ch.qos.logback.classic.net.SyslogAppender? I tried escaping with backslash, HTML-encoding but without success. Use case: My %msg has a JSON format, but I need to add some fields via MDC and then close the JSON message with a curly closing bracket. Kind regards, Philip