Magento 2 – parse knockout values to x-magento-init script

I’m trying to replace native minicart quantity field with my own ui component.

I created an override of vendor/magento/module-checkout/view/frontend/web/template/minicart/item/default.html.

My code :

<div class="details-qty qty">
     <div class="field qty" data-bind="scope:'miniCartQtyUpdater', attr: {id: 'cart-item-'+item_id+'-qty'}">
                        <!-- ko template: getTemplate() --><!-- /ko -->
                        <script type="text/x-magento-init">
                        {
                            "*": {
                                "Magento_Ui/js/core/app": {
                                   "components": {
                                        "miniCartQtyUpdater": {
                                            "component": "qtyUpdater"
                                            "defaultQty": need to parse ko value here
                                        }
                                    }
                                }
                            }
                        }
                        </script>
                    </div>
                </div>

Native code :

<label class="label" data-bind="i18n: 'Qty', attr: {
                           for: 'cart-item-'+item_id+'-qty'}"></label>
                    <input data-bind="attr: {
                           id: 'cart-item-'+item_id+'-qty',
                           'data-cart-item': item_id,
                           'data-item-qty': qty,
                           'data-cart-item-id': product_sku
                           }, value: qty"
                           type="number"
                           size="4"
                           class="item-qty cart-item-qty">
                    <button data-bind="attr: {
                           id: 'update-cart-item-'+item_id,
                           'data-cart-item': item_id,
                           title: $t('Update')
                           }"
                            class="update-cart-item"
                            style="display: none">
                        <span data-bind="i18n: 'Update'"></span>
                    </button>

I need to parse ko values such as item_id, qty and product_sku to get them in my viewmodel.

How can I achieve this? Is there another way? Thanks!