fix: Derived element json serialization

[tefra]

📒 Description

This broke with the new more strict typing analyze process, let's add it back

Resolves #xxxx

🔗 What I've Done

Write a description of the steps taken to resolve the issue

💬 Comments

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🛫 Checklist

• [ ] Updated docs
• [ ] Added unit-tests
• [ ] Sample tests pass
• [ ] W3C tests pass

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (874a6d2) to head (1254135).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1035 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 115 115 Lines 9265 9267 +2 Branches 2190 2191 +1 ========================================= + Hits 9265 9267 +2 ```

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