Install Neosemantics plugin on google cloud

Hi, I am new to the Google Cloud Platform and neo4j. So I hope my question is understandable.
I set up a GKE Cluster and Neo4j is deployed correctly I think. I can reach Neo4j now under http://localhost:7474/browser/, which is great.
Now I want to install Neosemantics as well (Installing neosemantics - Neo4j Labs). I am not sure how to do this on a kubernetes node. I can access the node it with SSH, but I don't find any "[$NEO4J_HOME] directory" to integrate the neosemantics- .

I hope someone can give me hint how to install it .
Thank you in advance!