Add a new block to the Footer - Dawn theme used

Store Design
6

@KetanKumar I have added this piece of code

{
  "type": "html_content",
  "name": "HTML Content",
  "settings": [
    {
      "type": "html",
      "id": "html_area",
      "label": "Custom HTML",
      "default": "

Some HTML content

"
    }
  ]
},

I don’t know if it’s the same thing you suggested to me.
I placed it in the Schema block of the Footer.liquid file.
I see the box in the settings but when I insert, for example, a piece of code it is not displayed.

Why?

Thanks