In the Tell Google about localized versions of your page guide, I understand that I have to use hreflang for language or region-specific pages for the multi-regional and multilingual website I’m currently building.
Because some of my article will possibly apply to more than one country but using the same language (for example the same Article could be valid for canada/english and us/english), I think that the Sitemap way would be more simpler than the HTML tags way.
I’ve seen that you recently released gatsby-plugin-advanced-sitemap. The documentation on it doesn’t mention hreflang settings option. Does it support hreflang?