ds-site/Configuration/TypoScript/Setup/RssFeed.typoscript

plugin.tx_seo {
    view {
        templateRootPaths {
            20 = EXT:ds_site/Resources/Private/Templates/Sitemaps/
        }
    }
    config {
        xmlSitemap {
            sitemaps {
                rssFeedAllBlogPosts {
                    provider = TYPO3\CMS\Seo\XmlSitemap\RecordsXmlSitemapDataProvider
                    config {
                        table = pages
                        sortField = lastUpdated
                        lastModifiedField = tstamp
                        additionalWhere = AND no_index = 0
                        pid = {$pageUids.blogPosts}
                        recursive = 3
                        template = RssFeed
                    }
                }
            }
        }
    }
}