Only canonical URLs must be stated with your sitemap, While Google suggests that doing so is really a weak canonicalization signal. If none of these are applied, Google will depend upon other alerts like hreflang, interior links, and URL length to pick a canonical for you if it believes you https://addons.prestashop.com/en/seo-natural-search-engine-optimization/31857-automatic-google-rich-snippets-json-ld-open-graph-seo.html