Create PHP script to add post meta to Woocommerce order note (backend)

Hi there, I need a script which adds certain post meta of an order to the order notes of that same order. The order note should be private, only backend access with a small static text with it. The post meta is as followed: _parcelpro_track The output in the order note should be as follow --> 'Tracking code: {_parcelpro_track value here}' Thanks for your submissions! In the files you can see the place I'm referring to (the order notes back-end).