Springfox (swagger) -如何添加动态属性

<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.9.2</version>
</dependency>
<dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.9.2</version>
</dependency>

@Configuration
@EnableSwagger2
public class SwaggerConfig {

    @Bean
    public Docket api() {
        return new Docket(DocumentationType.SWAGGER_2)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.example.api"))
                .paths(PathSelectors.any())
                .build()
                .apiInfo(apiInfo());
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("API文档")
                .description("这是一个RESTful API文档")
                .version("1.0.0")
                .build();
    }
}

@RestController
@RequestMapping("/api")
@Api(tags = "用户管理")
public class UserController {

    @GetMapping("/users/{id}")
    @ApiOperation("获取用户信息")
    @ApiResponses({
            @ApiResponse(code = 200, message = "成功", response = User.class),
            @ApiResponse(code = 404, message = "用户不存在")
    })
    public User getUser(@PathVariable("id") Long id) {
        // 根据id查询用户信息
        // ...
    }
}