How to search in multiple fields in v3 SelectFilter?

I am using the following relationship select filter:

SelectFilter::make('players')
      ->label(__('Players'))
      ->relationship('players', 'name_en')
      ->searchable()
      ->multiple()

SelectFilter::make('players')
      ->label(__('Players'))
      ->relationship('players', 'name_en')
      ->searchable()
      ->multiple()

SelectFilter::make('players')
      ->label(__('Players'))
      ->relationship('players', 'name_en')
      ->searchable()
      ->multiple()

SelectFilter::make('players')
      ->label(__('Players'))
      ->relationship('players', 'name_en')
      ->searchable()
      ->multiple()

When I enter a search query in the select filter it should not only find results with a match on "name_en" but also on "shortname_en".

What I tried:

Add an array of searchable columns to ->searchable(['name_en','shortname_en']) as it would work in the form select => Did not work
Use a virtual column => Did not work properly because there is not always a value in shortname_en (its nullable) so the virtual is empty in this case
Using a custom attribute on the model => Didn't work as Filters are doing a direct sql query

Anybody has an idea how to make the Filter search also search in "shortname_en"?