Use circe to preprocess dot-notation style fields

I have some json that includes some fields that are being flattened into a bson-ish format as in {"foo.bar" : "bash"}. I'd like to transform this to the following representation {"foo" : { "bar" : "bash"}} and wondering where in circe I'd do such an operation. Complicating the problem is that there could be multiple such fields that need to be properly merged, e.g. {"foo.bar" : "a", "foo.bash" : "b", "foo.baz" : "c"} -> {"foo" : { "bar" : "a", "bash" : "b", "baz" : "c"}}.