Trans tag with langcode option is not working

Language option to the Twig {% trans %} tag extension is not working

Requirement - I have to change language of a twig file content and not of the whole site.
Approach -
1. I used the trans tag with the langcode option in my twig file, the following way -

{% trans with {'langcode': 'es'} %}
  Thank you
{% endtrans %}

2. I have added the Spanish (es) string for "Thank you" in Admin->Regional & Language->Language

But I am not able to see the translated string of "Thank you".
Is there something I am missing ?