Hello @jasperkooij,
When migrating to Builder.io and Next.js, you can utilize the Builder content API in combination with Next.js to implement an XML sitemap, including the last modified date, and other relevant information.
Check out this forum post for detailed guidance on generating a sitemap.
Additionally, Builder pages provide a graphical UI for Search Engine Optimization (SEO) by default. You can find more information about SEO settings in Builder here.
If you have any further questions or need assistance with specific aspects of the migration, feel free to reach out!
Best regards,