Cloudflare for SaaS with Vanity & www Sub-domain

I am trying to have a domain with its www sub-domain pointed to my system. So far I have only been successful with this if I added 2 separate hostnames.

I think I read about wildcard somewhere but I don't see any wildcard options when creating the hostname.

Is that really is the way to go? Kinda bad for the client having to create so many DNS records to validate and to use our service.

Or did I miss anything?
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