Magento2 : Validation for category tree for create product frontside

I am using webkul marketplace extension. and i want to make category tree field required from seller side. but i dont know how do i do that. this is how category tree is render. so do i need to change here in json object or i need to customize javascript component for this tree

<div data-bind="scope: 'sellerCategory'">
                    <!-- ko template: getTemplate() --><!-- /ko -->
                <script type="text/x-magento-init">
                        "*": {
                            "Magento_Ui/js/core/app": {
                                "components": {
                                    "sellerCategory": {
                                        "component": "Vendor_Module/js/product/seller-category-tree",
                                        "template" : "Vendor_Module/seller-category-tree",
                                        "filterOptions": true,
                                        "levelsVisibility": "2",
                                        "options": <?= /* @noEscape */ $block->getCategoriesTree()?>,
                                        "value": <?= /* @noEscape */ json_encode($data('product')('category_ids'))?>

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Any help would be appreciate