You don't see the function because it's not there. The only confirmations from any other logging system that QRZ honors are those from LoTW Dave W7UUU
But I don't think it will recognize the confirmations. I doubt it. It can generate new confirmations if the other guy happens to use both systems.
To elaborate on this, QRZ honors LOTW confirmations only in the case of a LOTW>QRZ direct download only. QRZ does not respect ANY confirmations in ADIF imports at all, even if the ADIF came from LOTW.