import json

def export_json_report(speed, bounce_frame, lbw_decision, output_path="report.json"):
    report = {
        "lbw_decision": lbw_decision,
        "speed_kmph": round(speed, 2),
        "bounce_frame": bounce_frame
    }
    with open(output_path, "w") as f:
        json.dump(report, f, indent=2)