Single select with nested array

Summary:

Single select based on ADP with nested array

Content (required):

We have a requirement to define a single select LOV on assignment number. We are using getall_workers-workRelationships rest endpoint as we have to find all the active assignments of the persons across multiple workrelationships. Have defined AssignmentId as the key attribute and AssignmentNumber as the item text for the single select variable. While this works, we also need PeriodOfServiceId to be accessible as we need this to fire a patch operation on update-assignment end-point(which needs AssignmentId and PeriodOfServiceId) at the next step. We have noticed that PeriodOfServiceId is not available in the data object on selectvalueitemchange of the LOV