Custom Elementor condition

functions.php

<?php

add_action( 'elementor/theme/register_conditions', function( \ElementorPro\Modules\ThemeBuilder\Classes\Conditions_Manager $manager ) {
    require get_theme_file_path( 'gutenberg-page-condition.php' );

    $manager->get_condition( 'singular' )->register_sub_condition( new Gutenberg_Page() );
} );

gutenberg-page.php

<?php

if( !defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly
}

class Gutenberg_Page extends ElementorPro\Modules\ThemeBuilder\Conditions\Condition_Base {

    public static function get_type() {
        return 'singular';
    }

    public static function get_priority() {
        return 20;
    }

    public function get_name() {
        return 'gutenberg_page';
    }

    public function get_label() {
        return esc_html__( 'Gutenberg Page', 'domain' );
    }

    public function check( $args ) {
        if( !is_singular() ) {
            return false;
        }

        return !Elementor\Plugin::instance()->documents->get( get_the_ID() )->is_built_with_elementor();
    }
}