Python shell to msg.Topic for OPCUA client

I am experimenting a little with OPCUA in Node Red and would like to read a variable from a Python script in Node Red and transfer it to the OPCUA client in order to write a variable on the OPC server. I know how to do this with a dashboard switch, there is an entry for msg.Topic, where the name of the server variable to be written is entered. I also know how to read in a variable from a python script using the python-shell node. But how can I pass the variable to the OPCUA-Client Node and define which server variable is to be written?

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