I have two assignments in a flow. In the first assignment, I will be having dropdown with the list of operators. If operator  is selected then the second assignment should be routed to selected operator else it shld be routed to queue, We have custom logic for routing to queue. but on the second assignment we need to do conditional routing like if operator is selected then it should be routed to selected operator worklist else it should be routed to workqueue. How to acheive this conditional routing using custom activity.