Possible to pass parameters to a widget?

class StatementOverview extends BaseWidget
{
    protected static ?string $pollingInterval = null;
    protected Document $document;

//this doesn't work, but this is kind of what I need to do..
    public function mount($documentId)
    {
        $this->document = Document::find($documentId); 
    }

    protected function getStats(): array
    {
        return [
            Stat::make('Total of Matches', '$' . number_format($this->getTotalOfMatches() / 100, 2, '.', ',')),
        ];
    }

    protected function getTotalOfMatches()
    {
        return StatementTransaction::where('document_id', $this->document->id)
            ->where('some_other_filters_here', true)
            ->sum('amount');
    }
}