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I am afraid you need to have the object that you stored in the same or backward compatible form. What you might do is to make sure that both (old and new object) exists on class path and the create your own ObjectMarshallingStrategy that would extend default one. In your custom impl you would first the the object to read it in the old form and then manually move data to new one and that should be returned to the process. Here is an article that can help you started with ObjectMarshallingStrategy.
this assumes you use jbpm 5.3 and drools 5.4 or newer versions.
Ok thank you, I will try that way