We need to investigate if we can have a variable/context shared between build steps. A user is able to add multiple build steps with the machine-learning-plugin builder.
But variables declared in one context, are not available in the other contexts.
I am not sure if that's really required.
Users coming from a Notebook background, may want that. Users familiar with Jenkins, wouldn't expect that to work I think.
If the solution is hard, it might be better to leave it as-is.