Save argument of job

How to save the argument received from a job in a variable on zerynth?
For example this is argument{“pass”:500}. I would save 500 in a variable. How should i do?

in ZDM Jobs example, the callback fuction for custom job has the args.

def custom_job_1(obj, arg):
    #parse the arg and do something.
    return {
        'value 1': random(0, 100),
        'value 2': random(100, 200)