I don't think it's possible to edit the sitemap.xmlIn any case, the html code is fine, we have already solved the problem  https://developers.google.com/search/docs/specialty/international/localized-versions

I think it can work this way. PS. It must be customized based on the language of the site{%- comment -%} {{ content_for_header }} {%- endcomment -%} {% capture custom_content_for_header %} {{ content_for_header | replace: 'hreflang="en-IT"', 'href...