Hi @Santosh_Srinivas, in general I suggest avoid using custom modules whenever possible. Such workflows cannot typically be transferred across different n8n instances unless they both run a custom environment making such a module available. So when trying to use an API endpoint not available in the n8n OpenAI node you might want to consider using the HTTP Request node instead.
That said, if you do want to use the Code node with custom npm modules you could import them using require like so:
Hi @Santosh_Srinivas, I am afraid not as I am not familiar with this module. So I reckon your best bet would be to simply use the HTTP Request node if you want to interact with the OpenAI API outside of the OpenAI node.