Update each repeater field 2 fields outside the repeater

public static function form(Form $form): Form
{
  Repeater::make('items')
    ->schema([
       TextInput::make('title'),
       TextInput::make('qty')
         ->live()
         ->afterStateUpdate(function (Get $get, Set $set) {
           self::updateLineTotal($get, $set);
         }),
       TextInput::make('rate')
         ->live()
         ->afterStateUpdate(function (Get $get, Set $set) {
           self::updateLineTotal($get, $set);
         }),
       TextInput::make('discount')
         ->live()
         ->afterStateUpdate(function (Get $get, Set $set) {
           self::updateLineTotal($get, $set);
         }),
       TextInput::make('line_total')
         ->live(),
    ]),
  TextInput::make('subtotal')
    ->live()
    ->afterUpdateHydrated(function (Get $get, Set $set) {
      self::updateTotals($get, $set);
    })
    ->readOnly(),
  TextInput::make('discount')
    ->live()
    ->afterUpdateHydrated(function (Get $get, Set $set) {
      self::updateTotals($get, $set);
    })
    ->readOnly(),
  TextInput::make('tax')
    ->live()
    ->afterUpdateHydrated(function (Get $get, Set $set) {
      self::updateTotals($get, $set);
    })
    ->readOnly(),
  TextInput::make('total')
    ->live()
    ->afterUpdateHydrated(function (Get $get, Set $set) {
      self::updateTotals($get, $set);
    })
    ->readOnly(),
}