how to adding overlay percent

```flutter
overlayInfo: (candle) => {
  "💎": "🤚    ",
  "Hi": "${candle.high?.toStringAsFixed(2)}",
  "Lo": "${candle.low?.toStringAsFixed(2)}",
  "Percent" : ${candle.close! / candle.beforeClose!}
},
```

when we drawing percent overlap required before close how to draw it? is it possible?

if impossible, customizing the overlay callback onTap ??

