<｜begin▁of▁sentence｜>### Instruction:
As a Brand Manager, you have been tasked with analyzing the network of political books to gain insights into community structures. By utilizing the ego_networks function from the cdlib package, you can conduct community detection on the polbooks.gml file. Once the default level of community detection has been applied, convert the resulting communities into JSON format for further analysis and decision-making.
### Response:
import networkx as nx
from cdlib import algorithms

# Load the political books graph
G = nx.read_gml('polbooks.gml')

# Apply the ego_networks community detection algorithm
# with the default level (1)
communities = algorithms.ego_networks(G)

# Convert the communities to a JSON object
communities_json = communities.to_json()
print(communities_json)
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