Enter Test Run Fields in JSON format (Supports user defined fields only). User defined fields for test case execution can be specified under the "userDefinedFields" key. Ex. {"userDefinedFields": {"testcaseexecution_singleselectlist": ["Open"], "testcaseexecution_largetext": "Testing API Changes", "testcaseexecution_string": "Testing UDF API Changes", "testcaseexecution_number": 40, "testcaseexecution_mutliselectlist": ["Hindi","English"], "testcaseexecution_cascading": ["US","Nevada"], "testcaseexecution_date": "08-30-2019"}}