demo_display_value_as_price.php

<?php
/**
 * Display the value of a specific field as a price
 * Update the field_id to match your own field ID
 */
function demo_display_value_as_price( $value, $item ) {
	if( $item['field_id'] == '1047' && $item['type'] == 'number' ) {
		$value = wc_price( $value );
	}
	return $value;
}
add_filter( 'pewc_filter_item_value_in_cart', 'demo_display_value_as_price', 10, 2 );