Small WordPress Customize

Hello Developers

I have a WP Woocommerce website and need a small customize the invoice output

I am using the plugin "WooCommerce PDF Invoices & Packing Slips" to generalize the invoice into a PDF file which I will send to the client.

Everything is ok, except I need to display the "Unit Of Measure" (plugin WooCommerce Unit Of Measure) and the "Regular price" as in this picture https://prnt.sc/CTy6anFMbvPP

- The "Unit Of Measure" is the blue text (m, kg, cm) as you see in the picture
- The "Regular price" is the red text. Because I am using the Variable option to display two prices for a product, you need to get the price that has been selected in the cart, you can refer to the snippet from here https://bit.ly/3aixh7s

The template of the plugin can be found and customized at /plugins/woocommerce-pdf-invoices-packing-slips/templates/Simple/invoice.php

So, your job is to create two functions to output the "Unit Of Measure" and "selected price" of a product and show it on the template file invoice.php

I can set up ready a WordPress website on my hosting with plugins installed so you can take a quick look and check.

Thank you