dict_field.py

class SampleResource(ModelResource):
    # ... then ...
    
    def dehydrate(self, bundle):
        bundle = super(SampleResource, self).dehydrate(bundle)
        bundle.data['the_field'] = call_method_that_returns_the_dict()
        return bundle


# Or...

from tastypie import fields


class DictField(fields.ApiField):
    dehydrated_type = 'dict'
    help_text = "A dictionary of data. Ex: {'abc': 123}"
    
    def convert(self, value):
        if value is None:
            return None
        
        return dict(value)


class SampleResource(ModelResource):
    the_field = DictField(attribute='call_method_that_returns_the_dict')