[Python] Polars YYYY week into a date

Does anyone know how to parse YYYY Week into a date column in Polars?
I have tried this code but it throws an error.

import polars as pl

pl.DataFrame({
"week": [201901, 201902, 201903, 201942, 201943, 201944]
}).with_columns(pl.col("week").cast(pl.String).str.to_date("%Y%U").alias("date"))


InvalidOperationError: conversion from `str` to `date` failed in column 'week'
for 6 out of 6 values: ["201901", "201902", … "201944"]

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