I'm documenting a list of APIs using OpenAPI 3.0 and a separate YAML file for each API. All APIs use the same target server, so currently I have the following in each API definition: ` servers: - url: www.abc.com description: "Production Server" ` But I don't want to repeat the servers in all API definitions. Instead, I would like to reference the servers from a single file, like so: ` //sample.yaml ... servers: $ref: 'index.yaml#/servers' ` But Swagger UI shows the "Could not render this component" error. Is it possible to $ref the servers in OpenAPI 3.0 definitions?