As far as I understand, neither of the examples you mention allow for proper bi-directional editing.

> FreeCAD has ability to generate shapes or sketches with script and it would be possible to edit resulted geometry manually with GUI tools.

That sounds like the "normal" flow, where the first GUI editing action is destructive (= requires you to "emit" the parameterized geometry).

I think what is alluded to there, is something more akin to a visual Markdown editor, or newer visual React editors like Utopia[0], which are a departure from the old generation of WYSIWYG editors like Dreamweaver, where an edition action in either the code or the visual mode wreaked havoc on the state of the other mode.

[0]: https://utopia.app/