JSON to XML Request transformation

I am looking for Kong plugin to transform a complex json request body to xml format. I understand Request transformer can be used to add, remove or update request body elements. But will it support transforming the Json request to XML, with no elements added or deleted.

I am wondering if we have to use custom plugin to transform request to XML. Consider the case where the consumer is can consume REST based API and the provided is as Web Service( XML SOAP Message).

best regards,