Add products in cart with numeric value

[LilD]

How can I add products in cart with numeric value? From example cart page

[LilD]

            data: function() {
                return {
                    qty: this.quantity
                }
            },

            watch: {
                quantity: function (val) {
                    this.qty = val;

                    this.$emit('onQtyUpdated', this.qty)

                    console.log(this.qty)
                }
            },

            methods: {
                decreaseQty: function() {
                    if (this.qty > this.minQuantity)
                        this.qty = parseInt(this.qty) - 1;

                    this.$emit('onQtyUpdated', this.qty)

                    console.log(this.qty)
                },

                increaseQty: function() {
                    this.qty = parseInt(this.qty) + 1;

                    this.$emit('onQtyUpdated', this.qty)

                    console.log(this.qty)
                }
            }

For example, how could I make these values receive the data I type from the keyboard?

<script type="text/x-template" id="quantity-changer-template">
    <div :class="`quantity control-group ${errors.has(controlName) ? 'has-error' : ''}`">
        <label class="required">{{ __('shop::app.products.quantity') }}</label>
        <button type="button" class="decrease" @click="decreaseQty()">-</button>

        <input
            :value="qty"
            class="control"
            :name="controlName"
            :v-validate="validations"
            data-vv-as="&quot;{{ __('shop::app.products.quantity') }}&quot;"
            />

        <button type="button" class="increase" @click="increaseQty()">+</button>

        <span class="control-error" v-if="errors.has(controlName)">@{{ errors.first(controlName) }}</span>
    </div>
</script>

Without :value=qty can send data from keyboard but increase and decrease.. will not work