Computation from separate repeater

Repeater::make('repeater')
    ->schema([...]),

Placeholder::make('total')
    ->content(function ($get) {
        $total = Arr::map($get('repeater'), function ($item) {
            return $item['qtd'] * $item['price'];
        });

        return array_sum(array_values($total));
    })

Repeater::make('repeater')
    ->schema([...]),

Placeholder::make('total')
    ->content(function ($get) {
        $total = Arr::map($get('repeater'), function ($item) {
            return $item['qtd'] * $item['price'];
        });

        return array_sum(array_values($total));
    })