'stacked : true' option not available?

[BarbaraGonthier]

Hi there,
I've been trying to stack datas on the same bar in a bar chart but keep failing, has anyone ever tryed this option?
Below is my code in my controller:

    $queryTotalPerSeason = $subscriptionRepository->getQueryForTotalPerSeason();

    $totalBuilder
        ->query($queryTotalPerSeason)
        ->addDataSet('totalFemale', 'Femmes', [
            "backgroundColor" => self::TOTAL_PALETTE_F,
        ])
        ->addDataSet('totalMale', 'Hommes', [
            "backgroundColor" => self::TOTAL_PALETTE_H,
        ])

        ->labels('seasonName');
    $totalChart = $totalBuilder->buildChart('total-chart', Chart::BAR);
    $totalChart->pushOptions([
        'scales' => ([
            'xAxes' => ([
                'stacked' => 'true'
            ]),
            'yAxes' => ([
                'stacked' => 'true'
            ]),
        ])
    ]);

Here is my query:
public function getQueryForTotalPerSeason(): string
{
return "SELECT case when subscriber.gender= 'H' then count(subscription.subscriber) else 0 end AS totalMale,
case when subscriber.gender= 'F' then count(subscription.subscriber) else 0 end AS totalFemale,
season.name AS seasonName
FROM App\Entity\Subscription subscription
JOIN App\Entity\Season season
WITH season.id=subscription.season
JOIN App\Entity\Subscriber subscriber
WITH subscriber.id=subscription.subscriber
GROUP BY seasonName, subscriber.gender";
}

I have tryed to 'stacked : true' only on xAxes, only on yAxes, on both , I also tryed to add stack in the addDataSet:
->addDataSet('totalFemale', 'Femmes', [
"backgroundColor" => self::TOTAL_PALETTE_F,
"stack" => "0"
])
But nothing seems to work, I keep having 2 bars side to side, with a duplicate seasonName under each of them.
May this option not be available in this library?
Many thanks for your help