Free SSL certificate for my free subdomain in ProFreeHost

Hello,
I have obtained a free subdomain from ProFreeHost in order to host my small scientific web site. The URL looks like:
“my_subdomain.unaux.com”
I do not own the domain “unaux.com”, I only got its subdomain “my_subdomain.unaux.com”.
I now wish to secure my website. I found many tutorials and videos showing how to obtain a free SSL certificate from Cloudflare, but all of them explain how to do it for a domain (example.com), not for a single subdomain (my_subdomain.example.com).

My question:
How can I get a free SSL certificate from Cloudflare for my single free subdomain, without owning the full domain? Any good tutorial or video explaining step-by-step how to do it?

You cannot add subdomain.unaux.com to Cloudflare as unaux.com is not listed in the public suffix list, which is what Cloudflare uses to determine which sites can be added.
https://publicsuffix.org/list/

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