add_filter('woocommerce_get_price_html', 'wcfm_woocommerce_get_price_html', 10, 2);
function wcfm_woocommerce_get_price_html($price_html, $product) {
    // get your data about lowest price
    $lowest_price = get_your_lowest_price();

    // append it to original column string
    $price_html .= sprintf('<br /><br />Lowest price: %s', $lowest_price);

    return $price_html;
}