HOW TO: set a custom class on listview custom buttons

1

This is working fine

frappe.listview_settings['ASYCUDA Verification'] = {
    refresh: function(listview) {
        download_imports(listview);

        listview.page.add_inner_button(__("Download Imports"), function() {
            download_imports(listview);
             
        });

        // Add the btn-primary class to the button
        listview.page.inner_toolbar.find('button:contains("Download Imports")')
        .addClass('btn-primary');
    },
};