Navigation Widget on Blog Post

How do I create a navigation widget on a webflow blog post like on this website (the right-hand side where you can click on the name of the accelerator and it will take you to the given section of the blog): The 300 Best Accelerators and Incubators from United States

Here is my public share link: LINK
(how to access public share link)

This @Finsweet script may help you: