It is possible to change the door hinge for the Miele KFN 4898 AD fridge-freezer, but there is no specific information that the door hinge must be on the left as standard or whether it is directly available as a left-sided version. However, the door hinge can be changed on many Miele models, as described in the instructions for other models.
To ensure that the door hinge for the specific model KFN 4898 AD can be configured on the left-hand side, I recommend contacting Miele's customer service or consulting the operating instructions for the appliance.