Set field value from plugin

The CMS Questions
1

Hi,
I’m coding a plugin to generate alt text from OpenAI API.
From the image page, I create a button which when clicked fills the “alt” name field.
I already created the button, connect the API on click, get the correct response…
But I can’t fint the correct way to select the “alt” named field and chage its value.

Here is the code I use :

panel.plugin("my/altTextGenerator", {
	fields: {
		altgenerator: {
			props: {
				label: String,
			},
			template: '<k-button data-has-text="true" class="generator" :class="status" @click="generate_alt()">{{ label }}</k-button>',
			methods: {
				async generate_alt() {
					// Function to generate alt text with OpenAI
					// ..............

					$alt = 'Generated value'; // That value has to be stored on <input name="alt">
				}
			}
		}
	}
});

I think it’s a Vue.js problem, bu I never use it.

Thanks for your help.