在flask应用程序中无法正确呈现饼图

<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>

from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')
def index():
    # 生成饼图数据和配置
    labels = ['Red', 'Blue', 'Yellow']
    data = [10, 20, 30]
    colors = ['rgb(255, 99, 132)', 'rgb(54, 162, 235)', 'rgb(255, 205, 86)']

    return render_template('index.html', labels=labels, data=data, colors=colors)

<canvas id="myChart"></canvas>

<script>
    var ctx = document.getElementById('myChart').getContext('2d');
    var myChart = new Chart(ctx, {
        type: 'pie',
        data: {
            labels: {{ labels | tojson }},
            datasets: [{
                data: {{ data | tojson }},
                backgroundColor: {{ colors | tojson }}
            }]
        },
        options: {
            // 配置选项
        }
    });
</script>