Is your feature request related to a problem? Please describe.
No, this is not relevant to a problem, it's more of an enhancement that I would like to work on.

Describe the solution you'd like
I am interested in learning, how one would go about modifying the format of the Headers, such that all level one, level 2 level 3 headers can be collapsible. The capability I'm trying to achieve is similar to Toggle Headings in Notion notebooks. This would improve readability in blogs with lengthy content.

Describe alternatives you've considered
An alternative would be to create a custom component and then use that component instead of the standard markdown headers. However, I feel that this isn't good practice, and it would make more sense to customize the headers.

Additional context
I just need some directions on file(s) that I can play with to achieve this objective.