Does anyone know a method for creating news sitemap?

Sure. By collecting the info found in Hugo’s sitemap.xml, How to find days elapsed since last post in a listing page? and How to get a footer with build time?, I think you could use something like this:

{{ printf "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\" ?>" | safeHTML }}
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
  xmlns:xhtml="http://www.w3.org/1999/xhtml">
  {{ range .Site.RegularPages }}
    {{ if lt (div (sub now.Unix .Lastmod.Unix) 3600) 48 }}
      <url>
        <loc>{{ .Permalink }}</loc>{{ if not .Lastmod.IsZero }}
        <lastmod>{{ safeHTML ( .Lastmod.Format "2006-01-02T15:04:05-07:00" ) }}</lastmod>{{ end }}{{ with .Sitemap.ChangeFreq }}
        <changefreq>{{ . }}</changefreq>{{ end }}{{ if ge .Sitemap.Priority 0.0 }}
        <priority>{{ .Sitemap.Priority }}</priority>{{ end }}{{ if .IsTranslated }}{{ range .Translations }}
        <xhtml:link
                    rel="alternate"
                    hreflang="{{ .Lang }}"
                    href="{{ .Permalink }}"
                    />{{ end }}
        <xhtml:link
                    rel="alternate"
                    hreflang="{{ .Lang }}"
                    href="{{ .Permalink }}"
                    />{{ end }}
      </url>
    {{ end }}
  {{ end }}
</urlset>
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