Expand and collapse lists and headings

I'd like an easy way to expand or collapse content in lists and by headings. Use cases include:

• Showing a high level summary of information to one audience without divorcing the summary from the details.
• More easily reviewing an outline of information while focusing on the key points.
• More easily navigating a page with an abundance of text.

For collapsing by headings, the Expando add-on exists, but it's not supported or available for Cloud.
https://marketplace.atlassian.com/plugins/com.k15t.confluence.k15t-expando/server/overview

For lists, the built-in Expand Macro does not work with the built-in lists. It is essentially impossible to build a contiguous list while using Expand Macros for each item.

Suggestions:
Lists would either be collapsible by default or could be wrapped in a new macro that enables this functionality.
The user should be able to expand a single item or all items at that level in the outline.
Page editor should be able to designate whether a list is collapsed or expanded by default when viewed.

For an example of potential implementation of collapsible lists or outlines, see OneNote.
https://support.office.com/en-us/article/Use-outlines-to-structure-notes-and-ideas-56373f1e-f55e-4356-8e87-32e650e5d832?ui=en-US&rs=en-US&ad=US#bm4

Are there any applicable workarounds available today?