How to set vieBox for svg in amcharts?

Question

JavaScript

Good afternoon, I ran into a problem for adding viewBox attributes to a map created based on amcharts v4

var chart = am4core.create("chartdiv", am4maps.MapChart); // to create and use the container in which the svg
chart.SVGAttribute.viewBox is located = ('0 0 900 1000'); // set the required viewBox
log: Cannot set properties of undefined (setting 'viewBox')