feat(json-to-csv) add example default value

[gitmotion]

Fix: https://github.com/CorentinTh/it-tools/issues/1145

• add example json as default value

[vercel[bot]]

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud