Does TextEdit/QTextDocument could be used for a complex editable document

[Mykola Krachkovsky]

For my pet project a need QML item that allows editing of rather complex stuff. Something like formula editor in office applications. While TextEdit allows some HTML4, that's not enough for this task, as it can't edit, lets say something like mathematical matrix, system of equations or something like this:

Is it possible to use QTextDocument+QTextObject to achieve rendering and fluent editing, copy-pasting of such stuff?

If not, would it be better to rely on private API QQuickTextControl, or is it simpler to write it from scratch using QKeySequence to get OS independent behaviour?