import re
import json

def safe_parse_json(text: str):
    start = text.find("{")
    end = text.rfind("}")
    print(f"text type: {type(text)}")
    print(f"start: {start}, end: {end}")
    if start != -1 and end != -1:
        json_str = text[int(start) : int(end) + 1]
        print(f"json_str: {json_str}")
        return json.loads(json_str)
    return None

test_text = "Filler text {\"key\": \"value\"} more filler"
print(safe_parse_json(test_text))