Only canonical URLs need to be shown inside your sitemap, Even though Google says that doing this is actually a weak canonicalization signal. It will even allow you to increase the default "x-default" tag for people from countries for which the language is not really configured on your website or https://addons.prestashop.com/ru/seo-natural-search-engine-optimization/31857--rich-snippets-json-ld-opengraph-seo.html