from django.db import models
from django.utils.translation import gettext_lazy as _
class MyModel(models.Model):
    STATUS_CHOICES = (
        ('Created', _('Created')),
        ('Processing', _('Processing')),
        ('Finished', _('Finished')),
    )
    status = models.CharField(choices=STATUS_CHOICES)
    ...


from rest_framework import serializers
class MySerializers(serializers.ModelSerializer):
    status_display = serializers.CharField(source='get_status_display')

    class Meta:
        model = MyModel
        fields = ('status', 'status_display')