Use nlohmann::json

[jimporter]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.50%. Comparing base (5807a73) to head (c5cff39).
⚠️ Report is 92 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4492      +/-   ##
==========================================
- Coverage   89.51%   89.50%   -0.02%     
==========================================
  Files         242      242              
  Lines       13844    13840       -4     
==========================================
- Hits        12392    12387       -5     
- Misses       1452     1453       +1     

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