Change json parsing

Hongtao Yangrequested to merge
fix-json-parsing into main

What does this merge request do and why?

Change the json parsing logic to first extract out the json block

Ref: #817

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

Merge request checklist

  • I've ran the affected pipeline(s) to validate that nothing is broken.
  • Tests added for new functionality. If not, please raise an issue to follow up.
  • Documentation added/updated, if needed.

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