How to implement the SiteMap in sharepoint server 2019 for SEO

Question

We are implementing the SEO to make our site in Google, so we have created the Google search console account, we need to add the sitemap.xml file in that account which is associated with our website.

step is done on our side - In Site Collection Administration ->Search engine sitemap is started and I Robot.txt file also we got, Sitemap link: https://<Domain>:443/sitemap.xml,

Now the thing is in Sitemap.xml we have only,

<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">  <sitemap>
 <loc>https://<domain-name>:443/sitemap0.xml</loc>
 </sitemap>
 <sitemap>
 <loc>https:/<domain-name>:443/sitemap_mobile0.xml</loc>
 </sitemap> 
</sitemapindex>

So now how we can add our priority URL, and is there any default configuration setup in the SharePoint server to generate or to add?