使用django包的graphos，如何更改图形中各个条形图的颜色？

from graphos.sources.simple import SimpleDataSource
from graphos.renderers.gchart import BarChart

def my_view(request):
    # 创建数据源
    data = [
        ['Year', 'Sales'],
        ['2015', 100],
        ['2016', 200],
        ['2017', 150],
    ]
    data_source = SimpleDataSource(data=data)

    # 创建柱状图对象
    chart = BarChart(data_source)

    # 设置图表选项
    options = {
        'title': 'Sales Report',
        'colors': ['#FF0000', '#00FF00', '#0000FF'],  # 设置条形图的颜色
    }
    chart_options = {'options': options}

    # 渲染图表
    chart_html = chart.as_html(**chart_options)

    return render(request, 'my_template.html', {'chart_html': chart_html})

{% extends 'base.html' %}

{% block content %}
    {{ chart_html|safe }}
{% endblock %}