How to update a chart with data coming from an API endpoint in Svelte?

I am using the Svelte JS web framework with the Chart.js charting library to plot a bar chart. I have created a Skeleton project and installed the svelte-chartjs and the chart.js packages:

npm install svelte-chartjs chart.js

Under the routes folder, I made the generate/+server.js endpoint to simulate the API calls:

import { json } from '@sveltejs/kit';function getRandomNumber(min, max) {  return Math.floor(Math.random() * (max - min) + min);}export function GET() {  let randomNumbers = Array.from({ length: 12 }, () => getRandomNumber(10, 20));  return json(randomNumbers);}

It generates 12 random integer numbers between 10 and 20. Now, I can call this endpoint using the fetch('/generate') function on the root page. The content of the routes/+page.svelte file is the following:

<script>  import { Bar } from 'svelte-chartjs';  import { Chart, Title, Tooltip, Legend, BarElement, CategoryScale, LinearScale } from 'chart.js';  Chart.register(Title, Tooltip, Legend, BarElement, CategoryScale, LinearScale);  let fetchedData = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];  let data = {    labels: ['January','February','March','April','May','June','July','August','September','October','November','December'    ],    datasets: [      {        label: 'Random Number',        data: fetchedData,        backgroundColor: 'rgba(98,  182, 239,0.4)',        borderColor: 'rgba(98,  182, 239, 1)',        borderWidth: 2      }    ]  };  let options = {    responsive: true,    maintainAspectRatio: false  };  async function generate() {    const response = await fetch('/generate');    fetchedData = await response.json();  }</script><h1>Fetch Data from API endpoint</h1><button on:click={generate}>Request</button><p>Current data: {fetchedData}</p><div><Bar {data} {options} /></div>

I have initialized the data with 1 to 12 integers, which is changed when clicking the Request button. Therefore, the data fetching is successful however the bar chart is not updated with the newly generated values.