[Python] Set transparency (alpha) of area chart openpyxl

I want to set transparency to the background of an area chart using openpyxl. The code I have for the chart is:

from openpyxl.drawing.fill import PatternFillProperties, ColorChoice

c2 = AreaChart()
c2.grouping = 'stacked'
c2.add_data(data, titles_from_data=True)

c2_s1 = c2.series[0]
fill = PatternFillProperties()
fill.background = ColorChoice(srgbClr="FFFFFF")

c2_s2.graphicalProperties.pattFill = fill


I have tried using rgba hexadecimal encoding.

fill.background = ColorChoice(srgbClr="80FFFFFF")


I have also try to use SystemColor but I could not find any example of how to use it and every attempt I made was unsuccessful

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