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Adding a step-by step-progress bar

Hi there! I am looking to add a quazi progress bar to my site. It would outline a 3 step process and track down on the left side of the page. I was able to add the progress bar that scales down and I did this using a div block. Now I am looking to add number elements that would appear on the progress bar as it scrolls down. I took a screenshot of how I designed it in figma. Also, below is a site that does it pretty much exactly how I’d like to do it.

So my question is: how do I add the number elements? Or how to I make this progress tracker?

Here a live example and where I found the inspiration:

Here is my site Read-Only: LINK
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