feature request: flexible secret/configmap mapping

I have two secrets in another namespace, which I'd like to use to control how a function connects to a database: in namespace foo (say) database-config and legacy-database-config.

I would like to do the following: fission fn create bar --secret db-config=foo/database-config

which would map the secret keys to (say): /mappedsecrets/bar/db-config/...

Here bar is included in the path to disambiguate over different functions.