May I know what you are trying to complete? It seems to me that the chart does not have property "setValues"

For your purpose pls try chart column property "annotation":

\koolreport\widgets\google\ColumnChart::create(array(
    "title"=>"Sale Report",
    "dataSource"=>$this->dataStore('sale_amount'),
    "columns"=>array(
                "category",
                "sale"=>array(
                    "label"=>"Sale","type"=>"number","prefix"=>"$",
                    "annotation"=>function($row)
                    {
                        return "$".number_format($row["sale"]);
                    }
                ),
                ...
    )
)); 

https://www.koolreport.com/docs/google_charts/column_chart/#labeling-columns

You can even add multiple annotations with columns that have "role" => "annotation":

https://www.koolreport.com/examples/reports/google_charts/multi_annotation/

I see that you applied serialize function on your chart's columns, which resulted in error when columns contains any function. There're two ways to solve this:

1 . Use other methods instead of serializing columns unless you must use serialize in any case.

2 . Try the following more complex solution:

//in setup file MyReport.php, copy the value columns like "sale", etc:
...
->pipe(new \koolreport\processes\CopyColumn(array(
    "sale2" => "sale",
    ...
)))
->pipe($this->dataStore('sale_amount'));

//in view file use those copied columns with "role" => "annotation"
\koolreport\widgets\google\ColumnChart::create(array(
    ...
    "dataSource"=>$this->dataStore('sale_amount'),
    "columns"=>array(
                "category",
                "sale"=>array(
                    "label"=>"Sale","type"=>"number","prefix"=>"$"
                ),
                "sale2"=>array("role" => "annotation", "type" => "string"),
                ...
    )
)); 

With this way there's no function in your chart's columns.