Woocommerce append a text to total price on the "Cart", "Check out", "Thank you" pages & "Order recived" email

functions.php

<?php
// This code should be added to your WordPress child theme functions.php

// Woocommerce append a text to total price on the "Cart" & "Check out" page
add_filter( 'woocommerce_cart_totals_order_total_html', 'eworkshop_custom_total_message_html', 10, 1 );
function eworkshop_custom_total_message_html( $value ) {
	$value .= __('<br>some custom TXT') . '<br>';
	return $value;
}

// Woocommerce append a text to total price on the "Thank you" page & "Order recived" email
add_filter( 'woocommerce_get_formatted_order_total', 'eworkshop_custom_order_total_message_html', 10, 1 );
function eworkshop_custom_order_total_message_html( $total ) {
	$total .= __('<br>some custom TXT') . '<br>';
	return $total;
}