It's probably that the search result for Sitemap only showed up on your SERP only due to cache and the fact you're the store owner.
I tried to search for it and it did not show up on my search result page. In fact, this page is nested inside Omitted Results - which is Search Results Google deems irrelevant and not indexable.
So I'd say that you should not worry about it.
If you want to learn more about How To Remove an URL from Search Engine, check out this article: https://ahrefs.com/blog/remove-urls-from-google/#how-to-remove-urls
Let me know if my answer is of any help with a thumb up or like.
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Do you have internal anchor links to your sitemaps? Maybe remove those if so.
Only other way I could think to get those out of the index is to use an HTTP header returned only on .xml URLs like:
This is super advanced and you'd need something like Cloudflare O2O in front on a $200/mo business plan and some fairly custom code in the form of CF workers to insert on the fly. Also would introduce room to easily break the whole site if you don't know what you're configuring.
I'd be inclined to agree - not that big a deal, ignore.
Was thinking, if you throw up all of the sitemap URLs into GSC it may help Google to recognise them as a sitemap rather than as content. Just a theory but not hard to try.