The hreflang attribute (for SEO purposes) proides directions to the search engine  which is being used on a specific page, so the search engine can serve that result to users searching in that language

• hreflang tags can be configured by editors.
• It can be configured at a locale level and also page specific level
• Editors can configure:
  • Domain/URL
  • Country
  • Language
  • Multiple domain/URLs
• The hreflang attributes will be provided along with the SEO parameters meant for the site.
• The attributes would like below & it would be inserted in the header section of the page:

<link rel="alternate" href="https://www.sotyktu.com/" hreflang="x-default" />

<link rel="alternate" href="https://www.sotyktu.com/" hreflang="en-us" />
<link rel="alternate" href="https://www.sotyktuespanol.com/" hreflang="es-us" />       

Authoring guide link for hreflang Locale Page Properties.