'How to make changes in project json file in flutter?

I need to update my Stripe Public Key which get from api

 var jsonText = await rootBundle.loadString('assets/google_pay_payment_profile.json');
 data.value = json.decode(jsonText);
 data['data']['allowedPaymentMethods'][0]['tokenizationSpecification']
     ['parameters']['stripe:publishableKey'] = LocalStorage.stripePublicKey;

I make change in data but how to push this changes in json file?

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'How to make changes in project json file in flutter?

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