<｜begin▁of▁sentence｜>### Instruction:
As a network analyst using the NetworkX library, imagine that you are working with a social network dataset representing character interactions in the novel "Les Miserables," which is stored in a file named lesmis.gml. Your task is to detect communities in the network using the 'sbm_dl_nested' function available in the CDLib library and then generate a JSON representation of the resulting communities.
### Response:
import networkx as nx
from cdlib import algorithms

# Read the graph from file
G = nx.read_gml('lesmis.gml')

# Perform community detection using the nested Stochastic Block Model
coms = algorithms.sbm_dl_nested(G)

# Analyzing the result
communities_json = coms.to_json()
print(communities_json)
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