Confluence puts all of that in a single text box, AFAIK. Speaking of which, anyone know of a library that allows that kind of control and extensibility? Specif

Confluence puts all of that in a single text box, AFAIK. Speaking of which, anyone know of a library that allows that kind of control and extensibility? Specifically thinking custom render items that aren't boxes, tables and more text. Something like @mention but more complex.