Storing RV session file related global metadata

In RV what’s the preferred location to store custom ‘global’ data to the RV session?

I’m looking to persist some custom metadata for the RV session files so I can access that data again when I reopen the session.

Should you store the data on the /root node that seems to always exist in the sessions?

Or is it recommended to create a custom node in the session? That however might require to define a custom node type itself too - or maybe there’s some sort of metadata nodetype to use for that instead? I couldn’t quickly find anything that made sense other than that Root node type or maybe the RVSession node type.