title: Log4J2 JSONLAYOUT How to add custom Parameters
body: <p>How to add customized parameters to Log4j2’s JSONLAYOUT?</p>
  
  <p>Also is there a way to add pattern to the JSONLAYOUT’s message element?</p>
  
  <p>I have tried the options listed here -><br>
  logging.apache.org/log4j/2.x/manual/layouts.html#JSONLayout</p>
  
  <p>Please help!</p>