I want to use your XML Sitemaps with NGINX, is that possible?
Yes, of course! (We in fact do that ourselves) Here are the rewrite rules you'll need:
# Rewrites for Yoast SEO XML Sitemap rewrite ^/sitemap_index.xml$ /index.php?sitemap=1 last; rewrite ^/([^/]+?)-sitemap([0-9]+)?.xml$ /index.php?sitemap=$1&sitemap_n=$2 last;