item_schema["properties"]["data"] = {
                            "type": "string",
                            "contentMediaType": "application/json",
                            "contentSchema": content_schema,
                        }
                    sse_content["itemSchema"] = item_schema
                    operation.setdefault("responses", {}).setdefault(
                        status_code, {}

    # A Vocabulary for the Contents of String-Encoded Data
    contentEncoding: str | None = None
    contentMediaType: str | None = None
    contentSchema: Optional["SchemaOrBool"] = None
    # Ref: JSON Schema Validation 2020-12: https://json-schema.org/draft/2020-12/json-schema-validation.html#name-a-vocabulary-for-basic-meta
    # A Vocabulary for Basic Meta-Data Annotations