We will find a good solution for this inline script CSP issue for KoolReport widgets. Meanwhile you could try the following work around to add nonce attribute to KoolReport script tag like this:

<?php
// index.php
require_once "MyReport.php";
$report = new MyReport;
$content = '';
$content .= $report->run()->render(true); // add true to return a report output instead of output it directly

require_once "path/to/MyReport2.php";
$report2 = new MyReport2;
$content .= $report2->run()->render(true); 


$content = str_replace('<script type="text/javascript"', '<script type="text/javascript" nonce="416d1177-4d12-4e3b-b7c9-f6c409789fb8"', $content); // replace this nonce value with yours

echo $content;