How to initiate a change in the value of a variable bound to a field through v-model?

Question

Vue.js

I embed the markitup editor in the vue component, but when I insert any tags into the text, the value of the variable bound to the field through v-model does not change. The editor has the option to use the afterInsert method , which is what I did

afterInsert: function() {
        this.textarea.dispatchEvent(new Event("change"));
    },

but still the value of the variable does not change.
I checked about the same thing on the official Vue.js website - the situation is similar:

Maybe I'm calling the wrong event or do I need to process it somehow? Because on another page where there is no vue component of this, but the same editor setting is used, the save happens correctly.

Answer 1

app6.message = 'HELLO';

Answer 2

It was necessary like this:
this.textarea.dispatchEvent(new Event("input"));