Can I edit or add Hreflang Tags? (TMS)

Translate My Store app does not add hreflang tags. The hreflang tags are added automatically to your website by Shopify once a new language is added to your store.  

Here's some more information regarding this:

https://shopify.dev/tutorials/support-multiple-languages-in-apps-and-themes#developing-themes-that-support-multiple-languages


We're not sure if you can modify the hreflang tags.  I suggest that you contact Shopify's support team for more information about this.