如何从cmb2选项页面显示数据？

function mytheme_options_page() {
    cmb2_metabox_form( 'mytheme_options', 'My Theme Options' );
}

function mytheme_admin_menu() {
    add_menu_page( 'My Theme Options', 'Theme Options', 'manage_options', 'mytheme-options', 'mytheme_options_page' );
}

add_action( 'admin_menu', 'mytheme_admin_menu' );

function mytheme_options_fields( $cmb ) {
    $cmb->add_field( array(
        'name' => 'Text Field',
        'id'   => 'text_field',
        'type' => 'text',
    ) );

    $cmb->add_field( array(
        'name' => 'Textarea Field',
        'id'   => 'textarea_field',
        'type' => 'textarea',
    ) );

    // 添加更多字段...

    // 保存选项页面数据的函数
    $cmb->add_field( array(
        'name' => 'Save Options',
        'id'   => 'save_options',
        'type' => 'button',
        'text' => 'Save',
    ) );
}

add_action( 'cmb2_admin_init', 'mytheme_options_fields' );

$options = get_option( 'mytheme_options' );

echo $options['text_field'];
echo $options['textarea_field'];