How do I change the homepage (index page) to a new page template (.json template file)?

Store Design
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1

I have cloned my website and created a new website. The new website homepage (index.liquid) isnt showing the homepage design of the cloned site. Its basically blank.

How can I apply a new page template (.json template) to the homepage of the new site?
Iv found the index.liquid file and it just has the code:

{{ content_for_index }}

ANy help much appcrecaited