View/edit your business invoice

Could we add a button somewhere that shows a preview of what your invoice will look like to customers? For now, it could be placed under company settings (where you enter your company details).
I’d also like the option to customize the product description for each invoice. Some business owners request descriptions like “back training” or “back strengthening” so they can claim these as business expenses. (Of course, the product name can just appear on the invoice by default.)