在创建JavascriptConverter时,如何返回数组？

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

public class MyJavaScriptConverter implements JavaScriptConverter {
    private Gson gson = new Gson();

    @Override
    public Object convert(Object obj) {
        if (obj instanceof List) {
            return gson.toJson(obj, new TypeToken<List<Object>>() {}.getType());
        }
        return obj;
    }
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.GsonHttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.List;

@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Bean
    public HttpMessageConverter<?> customMessageConverter() {
        GsonHttpMessageConverter converter = new GsonHttpMessageConverter();
        converter.setGson(new Gson());
        return converter;
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(customMessageConverter());
    }
}