Loading external jar

[redeemefy]

I have an external library that is living in custom_lib/library.jar. In order to load the library, I created a step in the source tab to load it and store it in globalChannelMap('lib').

var su = globalChannelMap.get('su');

try {
  if(su === null) {
    globalChannelMap.put('su', com.domain.package.Utils(channelName));
    su = globalChannelMap.get('su');
    var libInfo =com.domain.package.LibraryInfo();
    logger.info(":::: LOADING LIB :::: " + libInfo.getVersion() + " " + channelName);		
  }
} catch (error) {
  logger.error(channelName + " :::: PACKAGE UTILS :::: " + " Something went wrong loading library " + error);
}

I have no issues utilizing the library on any step on the source, however, when I start working on destinations I need to globalChannelMap.get('su') per destination.

My understanding of globalChannelMap() is that the variable is available global to the channel and across all messages.

How I can load a jar once to be accessible to source and destinations for every msg?