Tomcat catalina.out in json format

hello all,
I'm trying to manage all the different stack trace we have in our tomcat catalina.out log.
I've implemented for the tomcat.log file the log4j->json formatter (https://github.com/logstash/log4j-jsonevent-layout) and works great. there's something similar for the catalina.out that is able to write catalina.out log in json format?
if there's no options, there's a working guide to grok correctly all the different type of catalina.out log entries?

thank you very
Nick

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