[Python] How to load a different file than index.html in FastAPI root path while using...

Here is a simple static FastAPI app. With this setup even though the root path is expected to return a FileResponse of custom.html, the app still returns index.html. How can I get the root path work and render custom.html?

from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse

app = FastAPI()


app.mount(
"/",
StaticFiles(directory="static", html=True),
name="static",
)

@app.get("/")
async def index() -> FileResponse:
return FileResponse("custom.html", media_type="html")

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