This is an essential feature that we just got on static pages in October 2023. But it was only added to static pages. There are many reasons why we also need this on CMS pages as well. My example is blog tags. We want to have blog tag pages where if you click on a tag at the bottom of a blog, you can go view all the other tagged posts. But we dont want these pages indexed. Allowing this option on CMS pages as well as the static pages should be something hopefully put on the roadmap soon