Agreed. Plugin is quite useless for some advanced cases without this feature. My case is I use complex kilometer yaml templates with separate docker images for each commit for tests in parallel. I wouldn't like to include 5kb yaml in each parallel step, instead of this I would like to inject env vars I need in target yaml file for each parallel step.
Yeah... this would make declarative jenkinsfiles a lot cleaner :) +1 + I don't think it's uncommon to need to use a value from previous stages in new pods