How can I fill inbetween these Green/Red Lines? - line

Question

I can't for the life of me figure out how to fill in between these horizontal lines.
I currently have 2 horizontal lines, & would love to fill them in with color or a gradient.
It's not the normal code, as these are formatted line.new...
Anyone knows how?
I would love to color these zones with a gradient, but can't figure out how to tell the code these exact horizontal lines
//#version=4
study(shorttitle = "[CC] Price Zone", title="[CC] Price Zone", overlay=true, max_bars_back=500)
// ●─────────────────────────────────────────────────────────────────── ∴ ───────────────────────────────────────────────────────────────────● }
maxBarsBack = 500
line bullEngulfOpen = na
line bullEngulfLow = na
//line bullEngulf50 = na
line bearEngulfOpen = na
line bearEngulfHigh = na
//line bearEngulf50 = na
previousRange = open[1] - close[1]
isBullEngulf = previousRange > 0 and close > open[1]
isBearEngulf = previousRange < 0 and close < open[1]
//colors//
coloropen = color.rgb(76,187,23,30)
colorwick = color.rgb(194,24,7,10)
if isBullEngulf
bullEngulfOpen := line.new(bar_index - 1, open[1], bar_index, open[1], extend=extend.right, color=coloropen)
bullEngulfLow := line.new(bar_index - 1, low < low[1] ? low : low[1],bar_index, low < low[1] ? low : low[1], extend=extend.right, color=colorwick)
//bullEngulf50 := line.new(bar_index - 1, ((high[1]+low[1])/2), bar_index, ((high[1]+low[1])/2), extend=extend.right, color=color.blue, style=line.style_dotted)
if isBearEngulf
bearEngulfOpen := line.new(bar_index - 1, open[1], bar_index, open[1], extend=extend.right, color=coloropen)
bearEngulfHigh := line.new(bar_index - 1, high > high[1] ? high : high[1], bar_index, high > high[1] ? high : high[1], extend=extend.right, color=colorwick)
// bearEngulf50 := line.new(bar_index - 1, ((low[1]+high[1])/2), bar_index, ((low[1]+high[1])/2), extend=extend.right, color=color.fuchsia, style=line.style_dotted)
//color gray when finished//
grayopen = color.rgb(49,51,53,10)
graywick = color.rgb(84,86,88,10)
var maxNumberOfEngulfings = 10
bullEngulfingCount = 0
for i = 1 to maxBarsBack
if not na(bullEngulfOpen[i])
if low < line.get_y1(bullEngulfLow[i])
line.delete(bullEngulfOpen[i])
line.delete(bullEngulfLow[i])
// line.delete(bullEngulf50[i])
continue
if low < line.get_y1(bullEngulfOpen[i])
line.set_color(bullEngulfOpen[i], grayopen)
line.set_color(bullEngulfLow[i], graywick)
// line.set_color(bullEngulf50[i], color.gray)
bullEngulfingCount := bullEngulfingCount + 1
if bullEngulfingCount > maxNumberOfEngulfings
line.delete(bullEngulfOpen[i])
line.delete(bullEngulfLow[i])
// line.delete(bullEngulf50[i])
bearEngulfingCount = 0
for i = 1 to maxBarsBack
if not na(bearEngulfOpen[i])
if high > line.get_y1(bearEngulfHigh[i])
line.delete(bearEngulfOpen[i])
line.delete(bearEngulfHigh[i])
// line.delete(bearEngulf50[i])
continue
if high > line.get_y1(bearEngulfOpen[i])
line.set_color(bearEngulfOpen[i], grayopen)
line.set_color(bearEngulfHigh[i], graywick)
// line.set_color(bearEngulf50[i], color.gray)
bearEngulfingCount := bearEngulfingCount + 1
if bearEngulfingCount > maxNumberOfEngulfings
line.delete(bearEngulfOpen[i])
line.delete(bearEngulfHigh[i])
// line.delete(bearEngulf50[i])