Wildcard subdomains setup?

[hkilaru]

I have a multi-tenant app with Vercel's new Platform tool, and I want to create different sitemaps for all of the subdomains.

Is there a way to ensure that all of the subdomains have a sitemap with their respective pages and the sitemap for the base url includes all of the subdomains?

E.g.
I want example.com/sitemap.xml to include site1.example.com, site2.example.com (like Substack's)

And I want site1.example.com/sitemap.xml to include all of the pages on that subdomain (like this Substack site)

When I set siteUrl: https://example.com, none of the subdomains are included in example.com/sitemap.xml, and all of the subdomain sitemaps are just showing the pages on https://example.com.

[hkilaru]

@iamvishnusankar thank you so much for building next-sitemap!

Is this wildcard subdomain setup possible today? I really appreciate the help.