Getting other Java project JARs into Docker image?

I have a Quarkus project that uses some other common code from another Java project that I use mvn install on so it has access to it locally. Within Quarkus applications theres a Dockerfile.jvm that you can use to build the Docker image. The question is how do I get this other project into the Quarkus application's Docker image that I want to use? If I use mvn package and copy the JAR files into the target/ folder it doesn't seem to get picked up so I'm not sure what other ways to try this. Do I need to maybe copy the JARs into the target/ folder and then run use a mvn install from that path or something?