From what I recall from my most recent trip into persistence service configuration, the underlying model has a notion of “filter”. I suppose these are rather for excludes since items or groups are specified to be included. Since handling of filters/excludes is currently missing in persist files and persistence manager I did my own experiments.
Based on that I coded my own persistence configuration mechanism which allows to manage exclusion filters:
I still do verify actual behavior to be sure it works. So, in theory with a lot of caution there is a way to exclude some of items from persistence policies.