Add a watcher for form fields

I'm using Laravel Nova, and I want to make "Save" button(on the Update view) unavailable while all required fields are empty. Here's the part of the code of the "Update.vue" file that creates my form fields:

<div v-for="field in fields">
 <component
    @file-deleted="updateLastRetrievedAtTimestamp"
    :is="'form-' + field.component"
    :errors="validationErrors"
    :resource-id="resourceId"
    :resource-name="resourceName"
    :field="field"
 /></div>

Fields array fills with the data from backend.

So I can see this structure in the Vue dev tool. And when I change the input value it changes value of <form-text-field>, but I don't see this changes anywhere in my Update component.

So my question is - How I can get changes of my input fields dynamically?

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