Mobile app using location services, need help/consultant on setup of location settings notification

We are creating an app in react native that uses location services. When the user downloads the app and then opens the app on an iPhone, they are given a Sign Up or Login screen. Before the user can decide to sign up, the "Location services" pop-up is coming up, asking 'would you like to allow the app to use your location?'

I would like to have a screen AFTER the user inputs email (AFTER deciding to sign up), where the user is then prompted to fill out the location settings. I am looking for someone with knowledge on how to make this change in the code.