table of cotent

As we all know, google dont like thin content. Bloggers are more likely to produce very long content with table of contents. I do know kadence has table of contents. However, it is not quite user-friendly for mobile readers. Cuz mobile readers have to click the scoll up icon to read the table of contents again for searching another headings they need. Is that possible to make the scoll up icon look like a book headings. When audience click on it, it is a table of content popping up. Just like what klook did in their blog https://www.klook.com/en-US/blog/family-friendly-staycations/