public void addProperties(String paramName, Schema schemaN) {
		if (mergedSchema == null)
			mergedSchema = new ObjectSchema();
		mergedSchema.addProperty(paramName, schemaN);
	}
Add properties.

@param paramName the param name
@param schemaN   the schema n
springdoc-openapi-starter-common/src/main/java/org/springdoc/core/models/RequestBodyInfo.java