PyCharm plugin cannot handle complex JSON configuration

[proboscis]

---\nMigrated from CyberAgentAILab/pinjected#125\nOriginally created by @proboscis on null\n\n---\n\n## Description

The PyCharm plugin is not properly handling complex JSON configuration for run configurations. When loading configuration JSON with deeply nested structures like:

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Expected behavior

The plugin should properly parse and create run configurations from this JSON structure.

Current behavior

The plugin fails to handle these complex nested configurations correctly.

Environment

• PyCharm version: [version]
• PInject Design plugin version: [version]
• OS: macOS

Additional context

This prevents users from automatically importing complex run configurations.