In reply to Lenin Zapata.

You paste it in Gutenberg editor simply. So rather than downloading the template & than import it in WordPress, you simply Copy & Paste in Gutenberg.

I am going to add a submit button on the Library page where the WordPress community can share their section designs.

I've put together a quick page already which you can try now. It also has an instructional video to guide you on how to prepare your template to submit.
https://templates.gutenberghub.com/submit/

Thanks