Keep response body object as dict instead converting to string from event handler

[radder5]

using the examples from https://docs.powertools.aws.dev/lambda/python/latest/core/event_handler/api_gateway/#lambda-function-url for a dict return value from a route, I'd like to keep that as a nested object within the body property but this always gets serialized to a JSON string.
e.g.
@app.get("/timings/<year>/<month>") def get_timings_by_month_year(year: Annotated[int, Path(ge=2023,le=datetime.now().year)], month: Annotated[int, Path(le=12, ge=1)]) -> dict: return {"timings": "some timings"}

returns

{ "statusCode": 200, "body": "{\"timings\":\"some timings\"}", "isBase64Encoded": false, "headers": { "Content-Type": "application/json" }, "cookies": [] }

I would like it to return

{ "statusCode": 200, "body": { "timings": "some timings" }, "isBase64Encoded": false, "headers": { "Content-Type": "application/json" }, "cookies": [] }

is this possible?
Thanks