web/web_dashboard_tile/static/src/xml/custom_xml.xml

<?xml version="1.0" encoding="UTF-8"?>
<templates id="template" xml:space="preserve">
    <t t-extend="SearchView.addtodashboard">
        <t t-jquery="form" t-operation="after">
            <div>
                <label for="dashboard_tile_new_name">Tile:</label>
                <input id="dashboard_tile_new_name" />
                <button id="add_dashboard_tile">Create</button>
            </div>
        </t>
    </t>
</templates>