Field with data from relationship (BelongsTo)

// On the UserProfile.php model
public function user(): HasOne
{
    return $this->hasOne(User::class);
}
// On the User.php model
public function profile(): BelongsTo
{
    return $this->belongsTo(UserProfile::class);
}
// On my UsersResource.php resource
Forms\Components\Section::make('Profil')
    ->relationship('profile')
    ->schema([
        Forms\Components\TextInput::make('country_code')
    ])
    ->columns(2),