How to set Dynamic schema target where i want to push the app embedded blog !!!!

[codeconfig]

{% schema %}

{

  "name": "Quick Announcement Bar",

  "target": "head", // need to here add the dynamic value handle the value from the admin panel !! 

  "settings": [

  ]

}

{% endschema %}

Could you give me solution best way how to do it ? ???  

Thanks advance !!!