Ability to change a toggle's heading level

Currently, you can apply a toggle to a heading, which is cool.
But you can't apply a heading level to a toggle.

Example:

• I create a “Heading 2” and apply a “toggle list” to it.
• I put a lot of content inside it.
• Then, eventually, I need to change it to a Heading 1: that will break the toggle, and I’ll have to redo everything!

This also means being able to remove a toggle from a heading (even though I don’t run into that situation as often).