Sling model exporter with a different character encoding in the response

Hello everyone,

Does someone know how can I change the character encoding in the response on a sling model exporter?

Here a piece of code that I'm using

@Model(adaptables = SlingHttpServletRequest.class,
   resourceType = {"..."},
   defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL
)

@Exporter(name = "jackson", selector = "des", extensions = "json", options = {@ExporterOption(name = "SerializationFeature.WRITE_DATES_AS_TIMESTAMPS", value = "true")})

In the client I'm getting:

Content-Type:

application/json; charset=ISO-8859-1

But I'd like to use "UTF-8" instead of ISO-8859-1