How to provide completely custom JSON for example in Swagger?

I have Java endpoint which receives json-deserializable object. Unfortunately, Swagger is unable to auto-generate good example for it. Is it possible to provide completely custom JSON for an example?

Example is below, regard class Body. It has two fields.

One field is a Set. I want to provide some example list of values for it. I can't use example parameter for this.

Another field is a Parent. It can contain one of two of subclessed, Child1 and Child2. Springfox generates me

{
  "parent": {
    "@child#": "string"
  },
  "tags": "[\"tag1\", \"tag2\"]"
}

and I can't send this value (it's incorrect serialization). While I want to have

{
  "parent": {
    "@child#": "1",
    "field1": "value of field 1"
  },
  "tags": ["tag1", "tag2"]
}

The code:

package com.example.demo;

import java.io.IOException;
import java.util.Set;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.DatabindContext;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.annotation.JsonTypeIdResolver;
import com.fasterxml.jackson.databind.jsontype.impl.TypeIdResolverBase;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.oas.annotations.EnableOpenApi;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;

@RestController
@SpringBootApplication
@Configuration
@EnableOpenApi
public class DemoApplication {

    @PostMapping(value = "/create", consumes = MediaType.APPLICATION_JSON_VALUE)
    public Body create(@RequestBody Body body) {
        return body;
    }

    @Bean
    public Docket docket() {
        return new Docket(DocumentationType.OAS_30)
            .select()
            .apis(RequestHandlerSelectors.basePackage(DemoApplication.class.getPackageName()))
            .paths(PathSelectors.any())
            .build()
            //.apiInfo(apiInfo())
            //.securitySchemes(Collections.singletonList(apiKey()))
            //.protocols(getProtocols(systemSettings))
            ;
    }

    public static class Body {

        @ApiModelProperty(example = "[\"tag1\", \"tag2\"]")
        public Set<String> tags;

        public Parent parent;

    }

    @JsonTypeInfo(use = JsonTypeInfo.Id.CUSTOM, property = "@child#", include = JsonTypeInfo.As.EXISTING_PROPERTY, visible = true)
    @JsonTypeIdResolver(MyTypeIdResolver.class)
    @ApiModel(discriminator = "@child#")
    public static class Parent {

        final String childTypeNumber;

        @JsonProperty("@child#")
        public String childTypeNumber() {
            return childTypeNumber;
        }

        public Parent(String childTypeNumber) {
            this.childTypeNumber = childTypeNumber;
        }
    }

    public static class MyTypeIdResolver extends TypeIdResolverBase {
        private JavaType superType;

        @Override
        public void init(JavaType baseType) {
            superType = baseType;
        }

        @Override
        public String idFromValue(Object value) {
            return null;
        }

        @Override
        public String idFromValueAndType(Object value, Class<?> suggestedType) {
            return null;
        }

        @Override
        public JsonTypeInfo.Id getMechanism() {
            return null;
        }

        @Override
        public JavaType typeFromId(DatabindContext context, String id) throws IOException {
            char c = id.charAt(0);
            Class<?> subType = null;
            switch (c) {
            case '1':
                subType = Child1.class;
                break;
            case '2':
                subType = Child2.class;
                break;
            default:
                throw new RuntimeException("Invalid Child type");
            }
            return context.constructSpecializedType(superType, subType);
        }
    }

    public static class Child1 extends Parent {

        public String field1;

        public Child1() {
            super("1");
        }
    }

    public static class Child2 extends Parent {

        public String field2;

        public Child2() {
            super("2");
        }
    }



    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}