Попробуйте
$Datetrains = DashboardTrain::where('promo', 'not like', 'Yes')->get();
$chart = Charts::database($Datetrains, 'bar', 'highcharts')
->title("Gender")
->elementLabel("Freq")
->dimensions(1000, 500)
->responsive(false)
->groupBy('gender');
return view('Dashboard', compact('chart');