how to set the string value while migratiuon time in laravel code example

Example 1: laravel before migration

Schema::table('users', function ($table) {
    $table->string('email')->after('id')->nullable();
});

Example 2: datetime-local laravel migration data type

public function getDateStartAttribute($value)
{
    return Carbon::parse($value)->format('Y-m-d\TH:i');
}

public function getDateEndAttribute($value)
{
    return Carbon::parse($value)->format('Y-m-d\TH:i');
}