Automatically use parameters defined in downstream subjobs

[HeroCC]

Hello! I'd like to be able to use a multijob to build several parameterized jobs. I realize I can make the multijob parameterized, and manually pass down all the parameters, however I'd love it if the MultiJob could poll the configurations of the subjobs, and automatically present the parameters. It would make my life a lot easier -- the subjobs are declarative pipeline jobs, so when they are updated in git someone has to go to the multijob and update the parameters there too. Having that process automated would be wonderful.

Thank you!