How to get Log4j 2 version using Standalone rule?

 <?xml version='1.0' encoding='UTF-8'?>

<!DOCTYPE Rule PUBLIC "sailpoint.dtd" "sailpoint.dtd">

<Rule language="beanshell" name="Log4j 2 version">

  <Signature>

    <Inputs>

      <Argument name="log">

        <Description>

          The log object is associated with the SailPointContext.

        </Description>

      </Argument>

      <Argument name="context">

        <Description>

          A sailpoint.api.SailPointContext object that can be used to query the database if necessary.

        </Description>

      </Argument>

    </Inputs>

  </Signature>

  <Source>

  String version = org.apache.logging.log4j.util.PropertiesUtil.class.getPackage().getImplementationVersion();

    return version;

  </Source>

</Rule>