Group metadata fields in OPR

[bmlancien]

Summary of the discussion

In order to improve visibility and user experience, group metadata items in the OPR that are saved as objects or lists.

Type of change (CHANGELOG.md)

Features

• Add a new functionality (#)

Changes

• Update existing functionality (#)

Bugs

• Fixed a problem with (#)

Removed

• Remove a broken link (#)

Documentation updates

• Updated documentation for (#)

Workflow checklist

Automation

Closes #1650

PR-Assignee

• [ ] 🐙 Follow the workflow in CONTRIBUTING.md
• [ ] 📝 Update the CHANGELOG.md
• [ ] 📙 Update the documentation on mkdocs

Reviewer

• [ ] 🐙 Follow the Reviewer Guidelines
• [ ] 🐙 Provided feedback and show sufficient appreciation for the work done