Magento 2 Blog Sitemap is an extension that allows you manage XML Sitemaps for Magento 2 Blog Extension by Magefan.
composer require magefan/module-blog-sitemap
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento setup:static-content:deploy
Once you install the extension you get a separate set of settings for blog XML Sitemap (same as default Magento XML sitemap).
You can also go to Marketing > Seo & Search > Blog Site Map and generate a blog sitemap.
The code is licensed under Open Software License.