We are doing a CQL-OMOP project via a 2 step process:
1) CQL FHIR queries using CQL Execution Engine
2) OMOP on FHIR server running on top of our OMOP CDM
So while we are not generating OHDSI JSON with CQL, we are able to do queries. That said, we would certainly love to see a CQL to OHDSI translator as well!