求助：如何在Pine Script中实现MACD高点突破时绘制plotshape？

我已经通过代码实现了跟踪MACD金叉后的价格高点，但不清楚如何存储之前的高点，以便判断K线何时突破该高点，希望有人协助实现：当这个高点被突破时，使用plotshape绘制标记。

以下是我的代码：

//@version=5
indicator("break high", overlay = true)

// === MACD ===
fastMA = input.int(title="Fast moving average",  defval = 12, minval = 7)
slowMA = input.int(title="Slow moving average",  defval = 26, minval = 7)
signalLength = input.int(9, minval=1)
MacdControl = input(true, title="MACD/Histogram Control")

[currMacd,,] = ta.macd(close[0], fastMA, slowMA, signalLength)
[prevMacd,,] = ta.macd(close[1], fastMA, slowMA, signalLength)
signal = ta.ema(currMacd, signalLength)
[macdLine, signalLine, histLine] = ta.macd(close, 12, 26, 9) //Zero Line


crossoverbull = ta.crossover(macdLine, signalLine)
crossoverbear = ta.crossover(signalLine, macdLine)


var can_find = false
condstart = crossoverbull
condstop = crossoverbear

can_find := condstop ? false : condstart ? true : can_find

var float highesthigh = na

highesthigh := if (condstart)
    high
else if (can_find)
    if (high > highesthigh)
        high
    else
        highesthigh
else
    na

plot(highesthigh, color=color.blue, style=plot.style_linebr)

参考示意图：显示MACD金叉后跟踪价格高点，突破该高点时添加标记的效果

内容的提问来源于stack exchange，提问作者Bob Cot