Create a page by importing data from an XML file ( On clicking a button inside admin options page)

So, are you looking for a JSON importer for Elementor? If so, why not use their native importer? See here:

However, if you would rather have an option in a menu, try this small plugin. It adds an importer under Tools > Import, called Elementor JSON Importer, that you can use to import JSON files (it technically also handles .zip files). With it, you can upload a JSON file and it generates an Elementor template from it. It saves the uploaded files in the wp-content/uploads folder.

<?php
/**
 * Elementor JSON Importer
 *
 * Plugin Name: Elementor Importer
 * Plugin URI:  https://example.com
 * Description: Imports local JSON data and creates an Elementor post.
 * Version:     0.1.0
 * Author:      Your Name Here
 * Author URI:  https://example.com
 * Text Domain: elementor-json-importer
 */

if ( ! defined( 'WP_LOAD_IMPORTERS' ) )
    return;

// Load Importer API
require_once ABSPATH . 'wp-admin/includes/import.php';

// Require Elementor API
require_once plugin_dir_path( __DIR__ ) . 'elementor/includes/template-library/sources/base.php';
require_once plugin_dir_path( __DIR__ ) . 'elementor/includes/template-library/sources/local.php';

// Make sure the importer class exists and is available.
if ( ! class_exists( 'WP_Importer' ) ) {
    $class_wp_importer = ABSPATH . 'wp-admin/includes/class-wp-importer.php';
    if ( file_exists( $class_wp_importer ) ) {
        require_once $class_wp_importer;
    }
}

/**
 * Elementor JSON Importer
 *
 * Will process JSON data for importing Elementor posts into WordPress.
 *
 * @since 0.1.0
 */
if ( class_exists( 'WP_Importer' ) ) {

    class Elementor_JSON_Importer extends WP_Importer {

        // Constructor
        public function __construct() {
            // Nothing.
        }

        // Executes on import dispatch.
        public function dispatch() {
            if ( empty( $_GET['step'] ) ) {
                $step = 0;
            } else {
                $step = (int) $_GET['step'];
            }

            $this->header();

            switch ($step) {
                case 0:
                    $this->greet();
                    break;
                case 1:
                    check_admin_referer( 'import-upload' );
                    $result = $this->import();
                    if ( is_wp_error( $result ) ) {
                        echo $result->get_error_message();
                    }
                    break;
            }

            $this->footer();
        }

        // Echoes page footer.
        protected function footer() {
            echo '</div>';
        }

        // Echoes greeting.
        protected function greet() {
            echo '<div class="narrow">';
            echo '<p>'.__( 'This importer allows you to extract posts from an Elementor JSON file into your WordPress site. Pick a JSON file to upload and click Import.', 'elementor-json-importer' ).'</p>';
            wp_import_upload_form( 'admin.php?import=elementor-json&amp;step=1' );
            echo '</div>';
        }

        // Echoes page header.
        protected function header() {
            echo '<div class="wrap">';
            screen_icon();
            echo '<h2>'.__( 'Import JSON', 'elementor-json-importer-importer' ).'</h2>';
        }

        // Performs the actual import by using methods of the Elementor API.
        protected function import() {
            $error = new WP_Error();
            $file = wp_import_handle_upload();

            if ( isset( $file['error'] ) ) {
                $error->add( 'upload-error', $file['error'] );
                return $error;
            }

            $source_local = new Elementor\TemplateLibrary\Source_Local();
            if ( ! method_exists( $source_local, 'import_template' ) ) {
                $error->add( 'elementor-api-error', __( 'Elementor API unavailable.', 'elementor-json-importer' ) );
                return $error;
            }

            try {
                $result = $source_local->import_template( basename( $file['file'] ), $file['file'] );
            } catch ( Exception $e ) {
                $error->add( 'elementor-import-error', __( 'Elementor import has failed.', 'elementor-json-importer' ) );
                return $error;
            } finally {
                wp_import_cleanup( $file['id'] );
            }

            echo '<h3>';
            printf( __( 'All done. <a href="https://wordpress.stackexchange.com/questions/351334/%s">View template</a>', 'rss-importer' ), esc_url( $result[0]['url'] ) );
            echo '</h3>';
        }
    }

    // Create a new instance of the importer class.
    $elementor_json_importer = new Elementor_JSON_Importer();

    // Attempt to register importer.
    $error = register_importer(
        'elementor-json',
        __( 'Elementor JSON Importer', 'elementor-json-importer' ),
        __( 'Import posts from an Elementor JSON file.', 'elementor-json-importer' ),
        array ( $elementor_json_importer, 'dispatch' )
    );

    if ( is_wp_error( $error ) ) {
        error_log( $error->get_error_message() );
    }   

} // class_exists( 'WP_Importer' )

function elementor_json_importer_init() {
    load_plugin_textdomain( 'elementor-json-importer', false, dirname( plugin_basename( __FILE__ ) ) . '/languages' );
}
add_action( 'init', 'elementor_json_importer_init' );

It depends heavily on the Elementor plugin, though, so make sure to check if it works each time the Elementor plugin receives an update.