Best way to share secure notes

My wife lost one of her credit cards last night. We called last night have her card frozen, but it was a bit of a PITA to login since we didn't have the card number.

My wife would like to keep a record of all our credit card numbers, along with the name on the card, and the toll free number for support. I was trying to think of a way we could do this electronically in the safest way possible.

We both use iPhones and we have Bitwarden. Bitwarden is end-to-end encrypted and has a secure note feature. I thought this would be a convenient option, and should be relatively secure, since it's end-to-end encrypted.

Wanted to know if there might be a better option for encrypted shareable notes for this kind of information.