Custom key mapping function for `malli.json-schema/transform`?

Hi! I've just picked up Malli for a project, and I was wondering if there is a way to use a custom key-fn (as in clojure.data.json or Jsonista's mappers) when converting to JSON Schema. My spec has namespaced keys, and the namespaces are dropped in the exported JSON Schema. For a bit of context, I'm working with Kafka streams, and will be feeding some of the topics to Elasticsearch. I would like to use their specified naming conventions when sending the data there (along with the corresponding schema). I can easily get the data as I need it this via a custom serde, but I'd rather not have to process the exported JSON schema, too.

Thanks for any pointers you can provide, and for this awesome library!