"parameters": [
                        {
                            "required": True,
                            "schema": {"title": "Level1", "type": "string"},
                            "name": "level1",
                            "in": "query",
                        }
                    ],
                    "responses": {
                        "200": {

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Item(BaseModel):
    name: str
    price: float


@app.get("/items/")
async def read_items() -> list[Item]:
    return [
        Item(name="Portal Gun", price=42.0),
        Item(name="Plumbus", price=32.0),
    ]
```

FastAPI will use the return type annotation to perform: