Attach User and Settings to my react App

[yuval-illumex]

We have a react app which uses nest.js for the server side and serving of the HTML files.
We want to have a different settings for every deployment, for example google analytics token (different token for staging and production for example).

According to the documentation, We need to inject the token in the Webserver before serving the html file.

However, in the nest.js documentation, we have two options:

1. Serve static, without a way to replace the data.
2. MVC (using hbs or any other templating tool) - But I don't find a way to combine it with my react app, how can I make my build output to be a template file?

I guess it's possible to create an api call "/settings" and get the settings from there, but I think to inject it as part of the serving makes more sense. Am I right? What will be the right approach to inject the data?