When editing the game page in intich.io, switch to the details section of your game description and toggle HTML view on the top right and try this code
<div style="padding: 10px;background-color: #e4eaef;border-radius: 2px;">
<style>
summary { list-style-type: ' 👁️ '; }
details[open] > summary { list-style-type: ' 🧿 '; }
</style>
<details>
<summary><strong><u>Header1</u></strong></summary>
<p>Text1</p>
</details>
<br>
<details>
<summary>Header2</summary>
<p>Text2</p>
</details>
</div>
More info on summery tags: