VueJS how to do v-if with condition if input is more than 2 characters?

Question

Vue.js

There is a layout that is divided into steps. The next step is activated if some action was performed in the previous step. In this case, if something is written to input, then the next step is activated. But the problem is that at first I have a currency sign in the input, and v-if works immediately, I would like to know how to make v-if work only when there are more than 2 characters in the input?

The input itself:

<div class="buy-voucher__amounts">
                                <input class="buy-voucher__custom-input" id="value-custom__voucher" v-on:input="changeVoucherCustom" v-model="CustomVoucherCount">
                            </div>

The v-if block itself:

<div class="booking__step" v-if="changeVoucherCustom">

Answer 1

The concept is like this:
<div class="booking__step" v-if="showStep">

data: {
    customVoucherCount: '$',
    showStep: false;
  },
  watch: {
    // эта функция запускается при любом изменении id="value-custom__voucher"
    customVoucherCount: function (newCount, oldCount) {

    this.showStep = newCount.lenght > 2 ? true : false;

    }
  },