Collapse Stack - Different names when open/closed

Foundry
1

To display the entire content, I created a link (External) with a Uniqie ID and entered “Read More” as a comprehensible name. Works perfectly! But now I want a different, equally understandable name when the content is open, because it still says “Read More” and that is quite confusing. For example, “Close”. Is that somehow possible?

2
3

Thanks for the link. Where and how do I install this?