It is already possible to customize SEO tags per Newspage publication. Today, you can do the same thing for your Newspage home page.
You can define a custom title page, description, and canonical URL. To improve the display and usability of your links on social media you can even set a custom Open Graph and Twitter Card title, description, and image.
To access the options, open a project on the Noticeable dashboard, click on “Newspage” in the left navigation and scroll down to the new subgroup entitled “Search Engine Optimization (SEO)”: