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Frappe chart in page ERPNEXT v8

Hi,
I created a page to display graphics,
I tried a basic js script but it gives an error in the console “frappe.chart is not a constructor”
Someone can take a look and point out the error in this.
Erpnext V8 version
Frappe V8 version

Code JS:

frappe.pages[‘prueba’].on_page_load = function(wrapper) {
var page = frappe.ui.make_app_page({
parent: wrapper,
title: ‘KPI gestion oportunidades’,
single_column: true
});

wrapper = $(wrapper).find('.layout-main-section');
wrapper.append(`
		<div id="chart"></div>
	`);


const chart_data = {
	labels: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
	datasets: [
		{
			values:['0','10','20','30','40','50','60','70','50','40','30','20']
		}
	]
};

const graph = new frappe.chart({
	parent: "#chart",
	data: chart_data,
	type: 'line'
});

setTimeout(function () {graph.refresh()}, 1);

}

Code HTML:

<div id="chart"