It does not appear that org.jenkinsci.plugins.workflow.cps.GlobalVariable implementations can contribute many details to the GSDL.

I just get an entry like this:
>> property(name: 'openshift', type: 'com.openshift.jenkins.plugins.pipeline.OpenShiftGlobalVariable')

Since there is no way straightforward way for Jenkins to introspect all of the methods I'm exposing from my variable definition, it would be nice if I could contribute my own GDSL snippet from my plugin's resources directory.