Class Config in class Book doesn't show on Swaggeer UI in FastAPI (on browser chrome). In POST request.

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from typing import Optional

from fastapi import FastAPI
from pydantic import BaseModel, Field
from uuid import UUID


app = FastAPI()


class Book(BaseModel):
    id: UUID
    title: str = Field(min_length=3)
    author: str = Field(min_length=1, max_length=100)
    description: Optional[str] = Field(title="Description of the book",
                                       max_length=100,
                                       min_length=1)
    rating: int = Field(gt=-1, lt=101)

    class Config:
        schema_extra = {
            "example": {
                "id": "1c1a2cf4-8302-45f7-847c-ce98e6da8d73",
                "title": "Computer Science Pro.",
                "author": "Coding with Yury.",
                "description": "A very nice description of a book."
            }
        }


BOOKS = []


@app.get("/")
async def read_all_books():
    if len(BOOKS) < 1:
        create_books_no_api()
    return BOOKS


@app.post("/")
async def create_book(book: Book):
    BOOKS.append(book)
    return book


def create_books_no_api():
    book_1 = Book(id="3c1a2cf4-8302-45f7-847c-ce98e6da8d73",
                  title="Title 1",
                  author="Author 1",
                  description="Description 1",
                  rating=60)
    book_2 = Book(id="3c2a2cf4-8302-45f7-847c-ce98e6da8d73",
                  title="Title 2",
                  author="Author 2",
                  description="Description 2",
                  rating=70)
    book_3 = Book(id="3c3a2cf4-8302-45f7-847c-ce98e6da8d73",
                  title="Title 3",
                  author="Author 3",
                  description="Description 3",
                  rating=80)
    book_4 = Book(id="3c4a2cf4-8302-45f7-847c-ce98e6da8d73",
                  title="Title 4",
                  author="Author 4",
                  description="Description 4",
                  rating=90)
    BOOKS.append(book_1)
    BOOKS.append(book_2)
    BOOKS.append(book_3)
    BOOKS.append(book_4)