No, not possible at Lufthansa.
Upgrading at Lufthansa Cargo requires 1000h long haul flying.
The only thing that has happened and can happen:
short haul FO
short haul Capt
long haul Capt
Within Condor which no longer belongs to Lufthansa,
an A320 FO can upgrade on B757/767.
BUT you will fly B757 for one year short haul and the get the B767.