How to change the OpenAI endpoint to the EU version

When attempting to call OpenAI as part of my automation, I'm encountering an error:

You are not allowed to access this resource in this geography from your current project

OpenAI explains this is due to:

A project designated for Europe is restricted to calling the EU-hosted endpoint ( https://eu.api.openai.com ), and vice versa.
If a request originates from a Europe-scoped project and is directed to the default US endpoint ( https://api.openai.com ), the platform will return the error mentioned above.

Is there a method to modify which endpoint the callin.io module utilizes? For example, the URL field states, “Enter a path relative to https://api.openai.com . For example, /v1/models.”

This doesn't appear to offer the option to switch to the EU API URL.