<｜begin▁of▁sentence｜>### Instruction:
I am a network analysis expert familiar with networkx. 

Suppose you are a data analyst working for a sports organization. Your team has collected network data on interactions between football teams in the American College Football league, stored in a football.gml file. Your task is to utilize the 'lfm' algorithm available in the 'cdlib' library to conduct community detection on this network. Specifically, you aim to identify overlapping communities and hierarchical structures by locally optimizing a fitness function. 

Additionally, after performing the community detection, you need to export the resulting communities in a JSON format for further analysis and visualization.
### Response:
import networkx as nx
from cdlib import algorithms

G = nx.read_gml('football.gml')
communities = algorithms.lfm(G, alpha=1.0)

# Export communities to JSON
communities_json = communities.to_json()
print(communities_json)
<|EOT|>
