Multibranch pipeline default post-step


Is there any option to have a default post-step after a Multibranch pipeline finished?

Background: We have about 1200 multibranch pipelines in our Jenkins. We want to synchronize the Gradle cache after each run, but not touch every Jenkins file. Now we are looking for a solution that we can use as a default after running each pipeline without touching the projects themselves.

Thank you in advance