Twenty Twenty Four – Child Theme

Good morning,
I premise that I am fairly new to wordpress, but I have a question regarding the use of twenty twenty four child themes.
I have created and enabled the child theme, it works correctly and everything is exactly like the parent one.
I would like to create a new page, with a different template from the existing ones. Following various guides, however, I have come to realise that this theme, unlike the old ones, is block-based, so it does not directly use php files that I could have easily modified in the child theme, but instead a .json file inside which, I understand, the templates, parts of templates and patterns are inserted.

However, I cannot understand how I can create a new template with this configuration, not even by studying the docuemnation offered by wordpress.

How can I do this?

Thank you very much in advance!