How to make one of the default checkboxes checked and disabled in Vue?

Question

Vue.js

Understanding Vue.
There is such a calculator
https://jsfiddle.net/w6r1dnyq/
But I can’t figure out how to tell him that the first service is always selected and this cannot be canceled? (Included in the package by default or always comes with another service that you have already chosen)

Answer 1

Like this, via computed with a link to v-model="product.checked"
https://jsfiddle.net/fg63dc1r/