extract_data() returns nested JSON instead of flat JSON as documented [ERROR]❌

[lnas01]

version：1.1.6
env: mac m1 cpu

Description:
According to the documentation, calling:
json_data = result.extract_data()
print(json_data)

should return all important data as flat JSON.

However, in practice, the returned json_data is nested / hierarchical, not flat as described.

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Only Local Web Interface's flat-json format is flat.

[linear]

PLG-265