You can add remarks to each material while adding them to your invoice list

Go to Sales >> Invoice.

Click + create.

Enter the fields.

Choose the material from the drop down.

Enter the information in the remark tab.

Click add +.

Keep adding material as much you need.

Make sure that remark tab is enabled in invoice template, to enable the option.

Go to Settings >> Invoice Template.

Go to Item table tab.

Click the remarks check box.

Click Save.

You can now view the entered item information in your invoice.