Merging two stores and setting HREFLANGS

[FranZurita]

Hi everyone. 

We were in the process of merging two Magento stores into one Shopify, and would like to know how to properly set the HREFlangs

1) The first magento was for Spain/International, with hreflangs es-Es and en-ES

2) The second magento was for Germany with hreflangs en-DE and de-DE

Currently we are using Shopify Markets to manage some diferences beetween countries (prices, text, etc) manged throught diferent pages ( optical and optical-germany)

Also both markets (Spain & International and German, are translated to Spanish, German and English

This would be the expected result 

<link rel="alternate" hreflang="es-ES" href="https://www.client.com/collections/gafas-graduadas">

<link rel="alternate" hreflang="es-DE" href="https://www.client.com/collections/gafas-graduadas-alemania">

<link rel="alternate" hreflang="de-ES" href="https://www.client.com/de/collections/brillen">

<link rel="alternate" hreflang="de-DE" href="https://www.client.com/de/collections/brillen-deutschland">

<link rel="alternate" hreflang="en-ES" href="https://www.client.com/en/collections/optical">

<link rel="alternate" hreflang="en-DE" href="https://www.client.com/en/collections/optical-germany">

<link rel="alternate" hreflang="x-default" href="https://www.client.com/en/collections/optical">

But instead Shopify is displaying this one, only es-ES, en-ES, de-ES

Could you please let us now how to proceed with this? Kind regards and trully thanks in advance, we are struggling with this

[FranZurita]

Please need help with this.

Kind regards

[FranZurita]

Let me know, we are stuck on this, thanks in advance.