While Gary Illyes, a Google analyst, thinks that search engines might depend significantly less on hreflang plus much more on automatic language detection in the future, for now, the tag is our best guess.  Second, If the articles is available via numerous URLs, other web-sites could link to unique URLs https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html