Column relationships problem

public function table(Table $table): Table
    {
        return $table
            ->columns([
                Tables\Columns\TextColumn::make('enseignants')
                    ->badge(),
            ])

class MatiereSession extends Pivot
{
    use HasFactory;

    protected $table = 'matiere_session';

    public function matiere(): BelongsTo
    {
        return $this->belongsTo(Matiere::class);
    }

    public function session(): BelongsTo
    {
        return $this->belongsTo(Session::class);
    }

    public function enseignants()
    {
        return $this->matiere->enseignants()->wherePivot('session_id', $this->session->id);

    }