[Bug]: community report prompt JSON-formatted string invalid

[lyiker]

Is there an existing issue for this?

• [X] I have searched the existing issues
• [ ] I have checked #657 to validate if my issue is covered by community support

Describe the bug

the prompt file in graphrag/index/graph/extractors/community_reports/prompts.py describe json format has double '{'

Return output as a well-formed JSON-formatted string with the following format:
    {{
        "title": <report_title>,
        "summary": <executive_summary>,
        "rating": <impact_severity_rating>,
        "rating_explanation": <rating_explanation>,
        "findings": [
            {{
                "summary":<insight_1_summary>,
                "explanation": <insight_1_explanation>
            }},
            {{
                "summary":<insight_2_summary>,
                "explanation": <insight_2_explanation>
            }}
        ]
    }}

llm use the prompt to generate output with error json format

json.decoder.JSONDecodeError: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)
16:23:33,904 graphrag.llm.openai.openai_chat_llm WARNING error parsing llm json, retrying

Steps to reproduce

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Expected Behavior

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GraphRAG Config Used

# Paste your config here

Logs and screenshots

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Additional Information

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• Python Version:
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