<?php
add_filter( 'woocommerce_get_price_html', 'njengah_text_after_price' );
function njengah_text_after_price($price){
$text_to_add_after_price = ' / por unidad'; //change text in bracket to your preferred text
return $price . $text_to_add_after_price;
}
add_action('woocommerce_add_to_cart', 'custome_add_to_cart');