{"type": "marker", "ts_ms": 0, "label": "Introduction"}
{"type": "click", "ts_ms": 2500, "x": 500, "y": 500}
{"type": "marker", "ts_ms": 5000, "label": "Main Feature"}
{"type": "click", "ts_ms": 7500, "x": 600, "y": 600}