Adding response headers in an angular application

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Angular10

Is there any way to add headers to the http response in an angular application, if the calls are made to fetch details from local json files?

Version: 8 and above.

Note: I have used HttpClient to fetch data from local json file.

What I have tried:

I've tried to use http interceptor, but it adds header to response only after the response have been received and then I've tried to use proxy in angular application using proxy.config.js file, but could not achieve the expected behavior.