Clarification Needed: Neo4j Connection for Neo4jGraph in Colab

[SandhiyaGiri]

I'm encountering a ValueError when trying to run the following code block in Google Colab:

kg = Neo4jGraph( url=NEO4J_URI, username=NEO4J_USERNAME, password=NEO4J_PASSWORD, database=NEO4J_DATABASE )

ERROR :
ValueError: Did not find url, please add an environment variable NEO4J_URI which contains it, or pass url as a named parameter.

Should I establish a connection to a Neo4j DBMS before running this code block? OR
Is there a simpler way to run this code in Colab, without explicitly connecting beforehand?