Feed a select field with data from multiple mysql tables

Hello,

I am using the following:

        Field::inst( 'bibliotheque_bibliotheques.oeuvre' )
            ->options( Options::inst()
                ->table( 'bibliotheque_oeuvres' )
                ->value( 'oeuvre_id' )
                ->label( array('oeuvre_id', 'titre',  'tome',  'auteur') )
                ->render( function ( $row ) {
                    if ( $row['tome'] & $row['auteur']) {
                    return $row['oeuvre_id'].' - '.$row['titre'].' ('.$row['tome'].') - ' .$row['auteur'] ;
                    }
                    if ( $row['tome']) {
                    return $row['oeuvre_id'].' - '.$row['titre'].' ('.$row['tome'].')' ;
                    }
                    return $row['oeuvre_id'].' - '.$row['titre'].' - ' .$row['auteur'].'' ;
                 }))
            ->validator( Validate::notEmpty( ValidateOptions::inst()
                ->message( 'Requis' ))),

To feed a select2 field:

            {
                label: "Oeuvre:",
                name: "bibliotheque_bibliotheques.oeuvre",
                type: "select2"
            },

The problem is that:
* if oeuvre_id, titre and tome are all part of the mysql table bibliotheque_oeuvres
* I would rather like to use the field bibliotheque_auteurs.auteur (the name) instead of auteur (the id, foreign key)

Anyone would know how I can trick the above code to achieve that?