How to get all options from table filter in table header action?

public function table(Table $table): Table
{
  return $table
    ->columns([ 
      // ...
    ])
    ->filters([
      Filter::make('client_project')
        ->form([
          Select::make('client_id'),
          Select::make('project_id')
        ])
        ->query(function (Builder $query, array $data) {
          // ...
        }),
    ])
    ->headerActions([
      Tables\Actions\Action::make('next-project')
        ->url(function (\Livewire\Component $livewire): string {
          $filters = $livewire->getTable()->getFilters();
          dd($filters['client_project']);
          // how do I retrieve all of the options listed in the 'project_id' Select component?
        })
    ]);
}