Proxy subdomain from third party domain

We have a heroku app that needs to be reused by different subdomains. I’m able to do this If I have access to the root domain, by updating the NS servers. Is is possible to do the same for subdomains from thiird party domains that are not in Cloudflare? We can configure the DNS on the subdomains as needed, but won’t have access to the root domain from the third party. Is this possible on any Cloudflare plan?
Thanks

It sounds like you want something like SSL for SaaS, which runs $2/month per hostname.

https://developers.cloudflare.com/ssl/ssl-for-saas

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