How do I view the JAR library logs included in the Android application in Logcat?

I have many operators 'System.out.println("some log to print");'in the JAR that I have included in my Android project. But I can not see the logs in Logcat.

1- I would like to know if there is a way to output these print statements to Logcat or to the terminal without adding a log library to my JAR?

2- If what I ask is not possible, what would you recommend as a registration library? log4j ?

Thanks for any help on this,