How to get workersUniqID from REST API or BI Publisher?

Summary:

How to get workersUniqID from REST API or BI Publisher?

Content (please ensure you mask any confidential information):

workersUniqID can be fetched via REST API but response is something like this:

Our target system cannot read such deep information (it is a substring of an array of array) so we are looking for a simpler way to get it, even via BI Publisher if necessary.

Is it possible?

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):