How to create the argument to pass to addCfnCondition

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**Which Category is your question related to?**
Override api gateway

**Amplify CLI Version**
7.6.21

**What AWS Services are you utilizing?**
Api gateway

**Provide additional details e.g. code snippets. _Be sure to remove any sensitive data._**
I'm trying to call `addCfnCondition` on the AmplifyApiRestResourceStackTemplate that I get in my api override. For this I understand that I need to build an object of type `ICfnConditionExpression` to pass as an argument. I did not find information about how to do that in the amplify documentation, but thought I had found it in `@aws-cdk` so I tried to import `@aws-cdk/core` and then use `Fn.conditionEquals` but I get `VMError: Cannot find module 'fs'` when trying to check out the environment.

How can I create the `ICfnConditionExpression` to pass to `addCfnCondition`?