how to change a char field to list field or array field in Django model?

I want the Char field "device_id" to be changed to a list field or an array field without loosing the current data present in the field , so it can hold multiple device ids.

class User(AbstractBaseUser, PermissionsMixin):
    id = ShortUUIDField(primary_key=True, editable=False)
    email = models.EmailField(verbose_name="email address", max_length=255, unique=True)
    phone = models.CharField(max_length=50, null=True)
    first_name = models.CharField(max_length=50)
    last_name = models.CharField(max_length=50)
    device_id = models.CharField(max_length=255, blank=True, null=True)

Usecase :I need the user to be associated with multiple devices here after

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