Thanks Daniel Qian for using the Pipeline Maven Integration. Your desire to rely on maven settings defined outside of the pipeline itself is definitively our best practice.
So far, We have just considered to redefine default Maven (global) settings at the folder level (precisely at the AbstractFolder level) (here.
If the config files can be redefined at the Pipeline (ie Item) level, then it would make sense to be able to define the Maven default settings at this level as well.
A technical challenge I see supporting redefinition of default (global) Maven settings at the Pipeline level is that we would probably have to write a dedicated config screen. At the moment, our configuration block is a fragment intended to be included in the folder configuration file.