Over the holidays I've cleaned up and released a little tool that lets
you use jq  to muck with S-expressions. You can install it with
`chicken-install sq`, links to sources below.
It currently only supports inputs that satisfy the JSON representation
used by SRFI-180  (which is also the one used by the medea egg), but
I may extend it to support arbitrary S-expressions in the future. 'Til
then I hope it's a useful little hack for someone.