...
"coverage_area_ta_list": {"derive_from":{"method":"get_tracking_area","args": {"coverage_area": {"get_param": "coverage_area_ta_list"}}}}
OOF :
The patchset - Return coverage-area list as JSON string (I9776b924) · Gerrit Code Review (onap.org) has to be included in the OOF-HAS src code to return coverage area TA list mapping.