Django Rest Framework format decimal field to 2 decimal places (for output)

I use Django and DRF,I have many decimal fields in models, like

amount = models.DecimalField(max_digits=16, decimal_places=4)

I want format output Two decimal places ，in every serializers field can do this

amount = serializers.DecimalField(max_digits=16, decimal_places=2)

There's an easyer way?