How to add charts to mail body in PHP - php

Question

I need to add a chart to my auto generated mail in PHP, after following the documentation from https://quickchart.io/documentation/ I have initiated a method as follows,
$chartConfig_datavolume = "{
type: 'line',
data: {
labels: [$date_array2_new],
datasets: [
{
backgroundColor: 'rgb(2, 39, 107)',
borderColor: 'rgb(2, 39, 107)',
data: [$value_array2_datavolume],
fill: false,
}
],
},
options: {
title: {
display: true,
text: 'Total Volume',
},
legend: {
display: false
},
scales: {
yAxes: [{
ticks: {
max: 5000 ,
min: 3000
}
}]
},
},
}";
$chartUrl_datavolume = 'https://quickchart.io/chart?w=400&h=200&c=' . urlencode($chartConfig_datavolume);
$messagenew.=nl2br(" \r\n \r\n");
$messagenew.= "Please see chart below:<br><br><img src=\"$chartUrl_datavolume\">";
This code will generate a chart as I need but the issue is with the scale,
scales: {
yAxes: [{
ticks: {
max: 5000 ,
min: 3000
}
}]
},
When I remove this part, the chart is generating but when I add this part chart is not generating. But with the editor used in quickchart, I could generate a chart with this part as well. Can someone help me to solve this issue.
Note: I am using this script in my RHEL 8 server and PHP 7.2.24 is installed on it