How to add/use/register elementor dynamic tag with elementor free version. This is a very easy and useful system of Elementor. Especially I feel the need for this when I use URL control. Help link -> (https://developers.elementor.com/dynamic-tags/)

functions.php

<?php

/**
 * Post URL list
 */
if (!function_exists('prefix_get_all_posts_url')) {
	function prefix_get_all_posts_url($posttype = 'post') {
		$args = array(
			'post_type' => $posttype,
			'post_status' => 'publish',
			'posts_per_page' => -1
		);

		$post_list = array();
		if ($data = get_posts($args)) {
			foreach ($data as $key) {
				$post_list[$key->post_name] = $key->post_title;
			}
		}
		return $post_list;
	}
}

/**
 * Include Dynamic Tag Class files
 */
require_once(plugin_dir_path(__FILE__).'inc/widgets/elementor/dynamic-tag/prefix-post-url.php');
if (class_exists('WooCommerce')) {
  require_once(plugin_dir_path(__FILE__).'inc/widgets/elementor/dynamic-tag/prefix-product-url.php');
}

/**
 * Register the Dynamic Tag
 */
add_action( 'elementor/dynamic_tags/register_tags', 'prefix_register_tags' );
function prefix_register_tags( $dynamic_tags ) {

	// To register that group as well before the tag
	\Elementor\Plugin::$instance->dynamic_tags->register_group( 'post', [
		'title' => 'Post'
	] );
	if (class_exists('WooCommerce')) {
		\Elementor\Plugin::$instance->dynamic_tags->register_group( 'woocommerce', [
			'title' => 'WooCommerce'
		] );
	}

	// Finally register the single post url tag
	$dynamic_tags->register_tag( new Prefix\Elementor\Tag\Prefix_Post_Url() );

	// Finally register the single product url tag
	if (class_exists('WooCommerce')) {
		$dynamic_tags->register_tag( new Prefix\Elementor\Tag\Prefix_Product_Url() );
	}
}

prefix-post-url.php

<?php
namespace Prefix\Elementor\Tag;

use Elementor\Core\DynamicTags\Tag;

/**
 * Post Url
 */
Class Prefix_Post_Url extends Tag {

	public function get_name() {
		return 'prefix-single-post-url';
	}

	public function get_title() {
		return __( 'Single Post Url', 'elementor-pro' );
	}

	public function get_group() {
		return 'post';
	}

	public function get_categories() {
		return [
			\Elementor\Modules\DynamicTags\Module::URL_CATEGORY
		];
	}

	protected function _register_controls() {
		$this->add_control(
			'prefix_single_post_url',
			[
				'label' => __( 'Post Url', 'elementor-pro' ),
				'type' => \Elementor\Controls_Manager::SELECT,
				'options' => prefix_get_all_posts_url(),
			]
		);
	}

	public function render() {
		$param_name = $this->get_settings( 'prefix_single_post_url' );
		echo wp_kses_post( $param_name );
	}


}

prefix-product-url.php

<?php
namespace Prefix\Elementor\Tag;

use Elementor\Core\DynamicTags\Tag;

/**
 * Product Url
 */
Class Prefix_Product_Url extends Tag {

	public function get_name() {
		return 'prefix-single-product-url';
	}

	public function get_title() {
		return __( 'Single Product Url', 'elementor-pro' );
	}

	public function get_group() {
		return 'woocommerce';
	}

	public function get_categories() {
		return [
			\Elementor\Modules\DynamicTags\Module::URL_CATEGORY
		];
	}

	protected function _register_controls() {
		$this->add_control(
			'prefix_single_product_url',
			[
				'label' => __( 'Product Url', 'elementor-pro' ),
				'type' => \Elementor\Controls_Manager::SELECT,
				'options' => prefix_get_all_posts_url('product'),
			]
		);
	}

	public function render() {
		$param_name = $this->get_settings( 'prefix_single_product_url' );
		echo wp_kses_post( $param_name );
	}


}