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I found that you can use Field Lookups to follow relationships and access fields in another related model:
import json
# ...
device_list = list(Device.objects.values('field1', 'field2', 'location__name', 'location__region'))
json.dumps(device_list)
The resulting JSON string:
[{field1": "value", "field2": "value", "location__name": "name", "location__region": "region"},
{...}]
Source:stackexchange.com