Data Security Policy for accessing Assignment Manager through REST API

Summary:

I am looking to access the workers endpoint with a role which has limited access to any non-essential data. The data I need for this role is Person Number, Assignment Status, Termination Date, Manager Assignment Number. I have run in to difficulty in accessing the Manager Assignment Number.

I am able to create a role with access to the other elements but I am having difficulty identifying the Data Resource and Privilege(/Action) I need to create as a Data Security Policy for this role in order to access the Manager Assignment Number.

Content (required):

The data from the workers endpoint I'm looking to return is held at;