How can i save array keys after modify?

Repeater::make('properties')
                    ->label('Страницы')
                    ->schema([
                        /// Inputs here
                    ])
                    ->columns(1)
                    ->itemLabel(fn(array $state): ?string => $state['label'] ?? null)
                    ->columnSpanFull()
                    ->collapsed()
                    ->reorderable(false)
                    ->deletable(false)
                    ->addable(false),