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define(
    [
        'uiComponent'
    ],
    function (Component) {
        'use strict';
        return Component.extend({
            defaults: {
                template: 'Vendor_Checkout/view/summary/custom'
            }
        });
    }
);

app/code/Vendor/Checkout/view/frontend/web/template/view/summary/custom.html

define(
    [
        'uiComponent'
    ],
    function (Component) {
        'use strict';
        return Component.extend({
            defaults: {
                template: 'Vendor_Checkout/summary/custom'
            }
        });
    }
);

app/code/Vendor/Checkout/view/frontend/web/template/summary/custom.html

[EDIT]

I deleted my answer. Because you edited your question and not related to the old version.

[EDIT]

I deleted my answer. Because you edited your question and not related to the old version.