If you think that, you don't understand the nature of what is being done with HTML nowadays. It's not about declarative markup, it's about efficient updating of a UI whose shape is completely decoupled from the shape of the state it is representing.
I'm a professional web developer, I'd like to think I know what I'm doing. And I believe you contradicted yourself, leveraging a Virtual DOM to update the DOM (which has an imperative API) from the changes that exist in two sets of data —both products of (an ideally) pure transformation from high-level data— is very much declarative programming.
Meanwhile QML provides you with the same kind of programming paradigm except that you do not have a DOM, you have the QtQuick Scene Graph which calculates how to render your new state in the most efficient way; and, worth mentioning, in a much more efficient way than a standard browser stack would be able to under regular circumstances.
