Not sure if this is already covered by the custom fields in Secure notes.
However, Lastpass had a really handy auto-population for Bank info. Bank name, Account Number, Routing Number. This alone would be helpful in Bitwarden since it doesn’t fit the credit card model, nor does it fit the login model.
This could be solved by either adding a Bank login type or possibly a build-your-own type, made up entirely of custom fields.