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I cannot apply the code, the following error is displayed "mychart.getDatasetMeta is not a function", but I solved it with the following(in config).
"widget" => array(\koolreport\chartjs\BarChart::class, array(
     "name" => "mychart11",
     "columns" => array(
         "FORMA PAGO",
         "SUBTOTAL" => array(
             "label" => "TOTAL NETO",
             "type" => "number",
             "decimals" =>2,
              "prefix" => "$"
         ),
        "TOTAL IVA" => array(
            "label" => "IVA",
            "type" => "number",
            "decimals" => $numDecimalesTotales,
            "prefix" => "$",
            "config" => array(
            "hidden" => true,
            )
       )
    ),
"stacked" => true
 ));
    
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