Preset value in rich text macro in page edit mode

Hey guys,

I’ve been working on setting a preset value in the rich text macro so that users will see our preset content(some hint text) when they edit our macro. Like the screenshot below:

This is doable when creating a page content with Content API and set the value in a predefined storage format. But I am wondering how we can do it without firing the API, what we trying to achieve is that when the user inserts our macro(through / command or macro browser) into a page, our preset value will present in the rich text macro container.

Any advice would be appreciated!


Any updates on this? trying to do the same thing