Using formatStateUsing on Select relationship

How can we, for example format a date with the source coming from a relationship? I've tried using formatStateUsing but it doesn't seem to work.

    public function form(Form $form): Form
    {
        return $form
            ->schema([
                Forms\Components\Select::make('bucket_id')
                    ->relationship(name: 'bucket', titleAttribute: 'date')
                    ->required()
                    ->preload()
            ]);
    }
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