Second Credit Card from which to top up account

Does anybody know is it possible to add the another credit card (additional, not replacing the first) from which to top up the Revolut account? If yes, then how to do it?
Revolut’s “Instant help” fails to respond to this question despite several inquiries since March 31.

Top up -> Card
(swipe right) -> Add New Card


Thanks, a lot! And have a great day!