Default Assignment DFF in Hire an Employee

Summary:

Hi - We have a DFF for Career Level that sits on Assignment. We would like this DFF to default based on the career level that sits in Job Details in Workforce Structures based on the job code that is selected while hiring. Unfortunately, I have tried every way I can think of to get it to work and I have not had any luck. Has anyone had to do something like this? Can you point me in the right direction?

This is the expression I was trying to use to default the field: [[ $fields.addPersonWorkRelationships.jobsLov.jobsDFF.careerLevel.$value() ]]