Most Chase cards have long been used with Apple Pay, including personal credit cards and business debit cards, but Chase business cards were not allowed. However, reader Hunt sent in that they are now able to add their INK Cash card to Apple Pay. I tried and had success with 2 of 3 Chase business cards.
On the official list, it still does not show Chase business credit cards as eligible, but it seems to be working now, in practice. YMMV.