Get Post Meta – for Composite or Bundled Product

I’m using Composite Products for Woocommerce (similar to Bundled Products). I’m trying to get a custom meta field from both the parent and the child of (each) item in the Order, final checkout stage.

Usually I would simply do (for each):

get_post_meta( $product_id, ‘my_custom_meta_here’, true );

Which would return my custom meta field ‘my_custom_meta_here’. I realise this is now complicated due to Composite Products, I somehow need to run get_post_meta for the Parent component and the Child, each have their own individual custom_meta I require to process the order.

But, I find the language very tricky. Here’s the documentation; https://docs.woocommerce.com/document/composite-products/composite-products-functions-reference/#get_product_from_item

For simplicity sake, each Composite Product is made up of just one Parent and one Child.

Thank so much for any guidance.