How to change DRF API SlugRelatedField Response template

Question

I have managed to create working model with 2 different serializers, depending what we are doing. Right now, ReadTitleSerializer returns this JSON object:

[
    {
        "id": 1,
        "category": {
            "id": 1,
            "name": "Movies",
            "slug": "movie"
        },
        "genres": [
            {
                "id": 1,
                "name": "Drama",
                "slug": "drama"
            }
        ],
        "name": "Drama Llama",
        "year": "1998-02-02",
        "description": null,
        "rating": null
    }
]

And this is response from WriteTitleSerializer:

{
    "id": 1,
    "category": "movie",
    "genres": [
        "drama"
    ],
    "name": "Drama Llama",
    "year": "1998-02-02",
    "description": null,
    "rating": null
}

How can I make WriteTitleSerializer respond similar to ReadTitleSerializer? I am using SlugRelatedField in WriteTitleSerializer because the JSON input should be list of slugs.

Input JSON

{
    "name": "Drama Llama",
    "year": "1998-02-02",
    "category": "movie",
    "genres": [
        "drama"
    ]
}

serializers.py

class ReadTitleSerializer(serializers.ModelSerializer):
    category = CategorySerializer()
    genres = GenreSerializer(many=True)

    class Meta:
        model = Title
        fields = '__all__'
        read_only_fields = ('category', 'genres')


class WriteTitleSerializer(serializers.ModelSerializer):
    category = SlugRelatedField(
        slug_field='slug',
        queryset=Category.objects.all(),
        required=True
    )
    genres = SlugRelatedField(
        slug_field='slug',
        queryset=Genre.objects.all(),
        many=True,
        required=True
    )

    class Meta:
        model = Title
        fields = '__all__'