I can do,
{ \"type\": \"record\", \"name\": \"Foo\", \"fields\": [ {\"name\": \"bar\", \"type\": { \"type\": \"record\",
From what I have been able to figure out so far, no.
There is a good write up about someone who coded their own method for doing this here:
http://www.infoq.com/articles/ApacheAvro