If you can limit yourself to the common subset of JSON Schema draft 5 and OpenAPI 3.0 schema objects, you'll be fine. If that's a problem, take a look at speccy (github.com/wework/speccy) which implements a filter to convert JSON Schema to OAS schema objects, using github.com/wework/json-schema-to-o...
Another possible approach is to use the x-oas-draft-alternativeSchema extension (github.com/OAI/OpenAPI-Specificati...) although as this is brand new, we don't yet know of any implementations - so would probably only suit your own tooling.
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