How can I return executable Javascript from my TYPO3 dashboard chart's data provider?

I'd like to implement line segment styling in a TYPO3 dashboard widget.

My data provider implements TYPO3\CMS\Dashboard\Widgets\ChartDataProviderInterface and provides a getChartData() method which returns the data in the format expected by Chart.js, so if I want every segment to be dashed this works:

public function getChartData(): array
    {
        return [
            'labels' => [...],
            'datasets' => [
                [
                    'label' => ...,
                    'data' => [...],
                    'segment' => [
                        'borderDash' => [6, 6]
                    ]
                ], ...
            ]
        ];
    }

I'd like to have the borderDash calculated based on the context of the segment. What I'd like to do that doesn't work is something like:

public function getChartData(): array
    {
        return [
            'labels' => [...],
            'datasets' => [
                [
                    'label' => ...,
                    'data' => [...],
                    'segment' => [
                        'borderDash' => 'ctx => ctx.p0.parsed.y == 0 ? [6,6] : undefined'
                    ]
                ], ...
            ]
        ];
    }

How can I return executable Javascript from getChartData()? (Or, is there a better way to solve this problem?)