From a quick test I have made, it is impossible to serve google (via Google Search Console) a sitemap for a certain domain from another domain (unless in the robots.txt). If you were my client I would recommend (highly insist) that you add a sitemap.xml to your domain. You have to make it as easy as possible for crawlers to find your sitemap and go around ...
SEORoundTable.com quotes John Mueller of Google in 2017 as saying,
Google can handle sites on IPv6 & HTTP/2 all just fine with Google web
, however he goes on to say you should still support IP4 and HTTP/1x. If you're not sure if you can use IP6 only, test with Google's Fetch or URL inspection.
They go on to quote Mueller as saying
Marking every part of the webpage that contains a signature as being
You can use the directive nosnippet:
Do not show a text snippet or video preview in the search results for
this page. A static image thumbnail (if available) may still be
visible, when it results in a better user experience. This applies to
all forms of search results (at ...