Hi,
You can combine these without a problem.

 <smart-combo-box item-template="template">
        </smart-combo-box>
        <template id="template">
            <span class="glyphicon glyphicon-ok">test</span>
            <span style="margin-left:5px;">{{label}}</span>
        </template>

JS Code
window.onload = function() {
const combobox = document.querySelector(‘smart-combo-box’);
combobox.dataSource = [“new item 1”, “new item 2”];
}
Best regards,
Peter Stoev
Smart UI Team
https://www.htmlelements.com/