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As you have not posted any code I can only give you a generic answer, but if I understand you correctly, you wish to add a custom field to a ModelSerializer thats not part of your model…
In DSF you can do this very esaily (read here):
In this case you just want a simple read-only field, so instead just use:
custom_field = Field(source='get_whatever')
In terms if validation after that please read the DRF guide here
Source:stackexchange.com