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