Adding email address of the vendor under the vendor name in Dokan (https://snipboard.io/G9FSBz.jpg)

functions.php

<?php
//Add vendor email alongside the vendor name
function add_email_in_cart( $item_data, $cart_item ){
    
    $vendor = dokan_get_vendor_by_product( $cart_item['product_id'] );

    if ( ! $vendor || ! $vendor->get_id() ) {
        return $item_data;
    }

    $item_data[] = array(
        'name'  => __( 'Email', 'dokan-lite' ),
        'value' => $vendor->get_email(),
    );

    return $item_data;
}

add_filter( 'woocommerce_get_item_data', 'add_email_in_cart', 11, 2 );
?>