我想使用python的pptx模块制作多个圆环图（最多3个）。目前我只能添加一个图表，如何相应地减少圆环图的大小，以便在一张幻灯片中调整2或3个图表。另外，如何根据不同数值的图表数量自动调整圆环图的大小。
Python代码：

from pptx import Presentation
from pptx.util import Pt, Cm, Inches
from pptx.chart.data import CategoryChartData, ChartData
from pptx.enum.chart import XL_CHART_TYPE

def create_ppt():
    
    pr = Presentation()
    slide1_register = pr.slide_layouts[0]

    #add initial slide
    slide1 = pr.slides.add_slide(slide1_register)

    #top placeholder
    title1 = slide1.shapes.title
    #subtitle
    sub_title = slide1.placeholders[1]

    # insert text
    title1.text = "Data"

    title_para = title1.text_frame.paragraphs[0]
    title_para.font.name = "Arial (Headings)"
    title_para.font.size = Pt(34)
    title1.top = Cm(1)
    title1.left = Cm(0)
    title1.width = Cm(15)
    title1.height = Cm(3)

    chart_data = ChartData()
    chart_data.categories = ['X1', 'X2', 'X3', 'X4']
    chart_data.add_series('Data 1', (75, 10, 5, 4))
    x, y, cx, cy = Inches(2), Inches(2), Inches(6), Inches(4.5)
    chart = slide1.shapes.add_chart(
        XL_CHART_TYPE.DOUGHNUT, x, y, cx, cy, chart_data
    ).chart
    chart.has_legend = True
    chart.legend.include_in_layout = False
    apply_data_labels(chart)

    pr.save("test222222222.pptx")
    
def apply_data_labels(chart):
    plot = chart.plots[0]
    plot.has_data_labels = True
    for series in plot.series:
        values = series.values
        counter = 0
        for point in series.points:
            data_label = point.data_label
            data_label.has_text_frame = True
            data_label.text_frame.text = str(values[counter])
            counter = counter + 1
    
    
create_ppt()

当前幻灯片：

预期输出：