Hi,

You have to change the xmlDependencies option in js where the template is defined and also need to extend the qweb template.

In your .js file :

odoo.define('module_name.recently_viewed', function (require) {
var publicWidget = require('web.public.widget');
publicWidget.registry.productsRecentlyViewedSnippet.include({
    xmlDependencies: (publicWidget.registry.productsRecentlyViewedSnippet.prototype.xmlDependencies || []).concat(
        ['/module_name/static/src/xml/website_sale_recently_viewed.xml']
    ),
});
});

in qweb xml file:

<?xml version="1.0" encoding="UTF-8"?>
<templates xml:space="preserve">
    <t t-extend="website_sale.productsRecentlyViewed">
        <t t-jquery="div.d-block" t-operation="replace"></t>
        <t t-jquery="button.js_add_cart" t-operation="replace"></t>
    </t>
</templates>

Hope it helps