import json


reports = json.load(open('C:/GlobalCube/Tasks/gctools/logs/config/reports.json', 'r'))
reports_filter = [r['meta']['optional'].keys()
                  for r in reports
                  if 'meta' in r and len(r['meta']['required'].keys()) > 0
                  and 'p_Zeit' not in r['meta']['optional']]
print(reports_filter[0])