Think we're talking about two separate things.
I believe the dots navigation is making the post part of a series. If you're using the v1 editor, you can add a post to a series by adding a series: series name line in the front matter:
series: series name
If you're using the v2 editor, you can click the additional settings button next to the "IMAGES" button, and add the series from there.
For Table of Contents, we don't have anything that fully supports it yet but we have a PR that will make it a bit easier at least.
Thank you!! This is exactly what I was talking about
Thank you Andy 😀
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