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Traditionally data like that is served from a separate endpoint, so when your front-end needs chart data (in that model), it would make a fetch
to get it from a separate URL on your site, eg. yoursite.com/chartdata/5
.
However, if you have the data already on load, you can simply put it into a Javascript variable, by outputting it inside a <script>
tag, eg.
<script>
const chartData = *outputHereAsJSON*;
useYour(chartData);
</script>
Source:stackexchange.com