Hello @user6272 ,
No, since the majority of email programs and networks will either break anchor links or even spam out emails with them, we have no plans to reinstate this functionality. Table of Contents for emails would only function as anchor links.
If your newsletter is particularly long, I'd recommend offloading some of the content either
into custom landing pages or onto your website, which you can then link to via Read More blocks, or
having your newletter be a linked PDF document, and your base email just an announcement that the newsletter is available for viewing/downloading.
See also:
The best length for an email
Fill a newsletter-style email with engaging content
... View more