Can I configure a bidirectional Data Mapping in Microsoft FHIR server ?

Question

I'm deploying an (FHIR server from Microsoft(https://github.com/microsoft/fhir-server)). I couldn't find any resources to unplug the persistent layer of the FHIR server and use a bidirectional data converter to use on top of my existing database so that I don't need to change its schema. I see that there is a data converter released by Microsoft but it is still unidirectional and is to fill up the persistent datastore.

It will be helpful if I can get some leads on this, advance thanks!