How can I hide my API keys in CRA?

[ghost]

I have a simple interface but I work with multiple APIs so I don't want to use a backend for it. How can I hide my API keys in CRA without using backend.

It is suggested to use environment variables for this and I have also used it as shown in the documentation but this is not exactly what I want. Even though I use environment variables , a simple CTRL + F search in the "chunk.js" files reveals things that should remain hidden, like my API keys. Is there a way to completely prevent this?