The WorkflowGen web application is currently not affected by this vulnerability, since its technologies are based on IIS, .NET Framework and Node.js. The application does not use or embed any modules or libraries from the Apache Log4j solutions.
References on CVE-2021-44228:
https://logging.apache.org/log4j/2.x/security.html
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44228
https://msrc-blog.microsoft.com/2021/12/11/microsofts-response-to-cve-2021-44228-apache-log4j2/