Magento 2 use custom data in ui component

I'm adding a custom UiComponent to checkout using Layout Processor:

1. LayoutProcessor.php

$this->jsLayout['components']['checkout']['children']['sidebar']
['children']['summary']['children'] = [
'my-item' => [
    'displayArea' => 'my-item',
    'component' => 'Vendor_Module/js/view/my-item',
    'config' => [
        'template' => 'Vendor_Module/my-item'
    ],
    'custom-data' => 'some custom data' 
];

2. Vendor_Module/js/view/my-item.js

define(
    [
        'jquery',
        'ko',
        'uiComponent',
        'Magento_Checkout/js/model/totals'
    ],
    function ($, ko, Component, totals) {
        'use strict';
        return Component.extend({
            items: ko.observable([]),
            initialize: function () {
                this._super();
                totals.getItems().subscribe(function (items) {
                    this.setItems(items);
                }.bind(this));
            },
            getItemsToRender: function () {
                `I want my custom data here`
            }
        });
    }
);

Is it possible to "send" custom data from LayoutProcessor to js component?