How do I add a label to identical cards in Wallet?

I have 2 identical transit cards in my Apple wallet. One is for personal use. The other for business use. Unfortunately, other than the position in the stack and the amount of money on the card there is no way to tell which card is which. It seems like there has to be some way to add a label to the cards, ideally at the top so I can know which one to select. How can one add a label to cards in Apple wallet?