Product variations not showing on PDF invoice – which shortcode to use?

Hi,

I’m using a plugin to generate PDF invoices for customer orders.

In my custom invoice template, I’m displaying the list of ordered items using the [item_name] shortcode to show the product name. However, I’ve noticed that product variations (such as size, color, etc.) are not showing up on the invoice.

I’ve tried using [item_meta] and [item_meta_data], but nothing displays or the field stays empty.

👉 Which shortcode should I use to properly display product variations on the PDF invoice?
I’m trying to achieve something like:
T-shirt – Size: M – Color: Red

For reference, I’m using the Attribute Stock plugin to manage stock per variation.

Any help or guidance would be greatly appreciated.
Thanks in advance!