[Python] polars equivalent of pandas set_index() to_dict

I have a polars dataframe:

import polars as pl
df = pl.DataFrame({'index': [1,2,3,2,1],
'object': [1, 1, 1, 2, 2],
'period': [1, 2, 4, 4, 23],
'value': [24, 67, 89, 5, 23]})


How do I do the following in polars that is easy enough in pandas:

In [2]: df.to_pandas().groupby("index").last().transpose().to_dict()
Out[2]:
{1: {'object': 2, 'period': 23, 'value': 23},
2: {'object': 2, 'period': 4, 'value': 5},
3: {'object': 1, 'period': 4, 'value': 89}}

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