Hello Gary et al. The doc's for 2.2.1 have this intriguing line. :-) Is it the case that it is possible (or intended) to add this in the future. I did a quick Jira search but did not find anything relating to it.
At this time, you cannot advise an entire <chain/> of endpoints. The schema does not allow a <request-handler-advice-chain/> as a child element of the chain itself.