在Pine Editor中，如何在会话的最后一条杆的高低上绘制一条线，并将其延伸到下一会话的最后一条杆？

//@version=5
indicator("Session Line", overlay=true)

// 获取当前会话的最后一条杆的高低
lastBarHigh = request.security(syminfo.tickerid, "D", high[1], lookahead=barmerge.lookahead_on)
lastBarLow = request.security(syminfo.tickerid, "D", low[1], lookahead=barmerge.lookahead_on)

// 获取下一会话的最后一条杆的高低
nextSessionLastBarHigh = request.security(syminfo.tickerid, "D", high[2], lookahead=barmerge.lookahead_on)
nextSessionLastBarLow = request.security(syminfo.tickerid, "D", low[2], lookahead=barmerge.lookahead_on)

// 绘制线
line.new(x1=bar_index[1], y1=lastBarHigh, x2=bar_index[2], y2=nextSessionLastBarHigh, color=color.red, width=2)
line.new(x1=bar_index[1], y1=lastBarLow, x2=bar_index[2], y2=nextSessionLastBarLow, color=color.blue, width=2)