<aside> 📌 December 23, 2021 Update: Notion supported Toggle Heading, which means you no longer need to create it by inline equation following step 1. If you want to open a toggle as a page, jump to step 2.
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Asked on reddit
Effect: making a toggle with the size of Heading 1, which is also a clickable page itself. It would toggle what's on the page.
If you only want a page like toggle, here is an example. Only step 2 is needed to get its link.
Use inline TeX equations to make a toggle looks like heading.
Notice that it won't be shown in TOC, so you may need to type your own TOC.
Reference: ‣ by Ben Smith.
I used \\LARGE\\textsf{Heading 1}
for Default Font Style example. Choose whatever you want. The Serif Font Style looks more alike.
Examples
Default Font Style
\\LARGE\\textsf{Heading 1}
Serif Font Style
\\Large\\textbf{Heading 1}
\\LARGE\\text{Heading 1}