Set default value for Builder component

Builder::make('form')
                ->blocks([
                    Block::make('values')->schema([
                        TextInput::make('percent')
                            ->numeric()
                            ->required()
                            ->placeholder('20'),
                    ])
                ])
                ->default([
                    'type' => 'values',
                    'data' => [
                        'percent' => 1,
                    ],
                ])
                ->maxItems(1)
                ->blockNumbers(false)
        ];