As I wrote a week ago somewhere else, the transfer is - to my understanding - “unsupported” by Wise’s acceptable use policy.
Wis’s borderless account provides you with multiple personal IBAN (in your name) in different European countries - notably not Switzerland / for CHF.
Generally your best bet would be a Swiss domestic transfer. IBKR do provide Swiss bank transfer details, at least to Swiss customers.
Otherwise you might check this older thread. Maybe you can get away by making a BEN transfer - but still somewhat “unpredictable” IMO.