How can Model represent a non-json schema for the swagger example?

[renjiandreamore]

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For example I have an API that will return a 'text/plain' type response, but when I use @api/namespace.response it only allow me to pass a Model instance into, and the model is actually a json-like(dict) thing, and in the swagger api I will see something like
{"response_key": "response_value"}, however my actually response is just a text, so there is no json-like response actually. How can I represent the example in the swagger doc?