To do it in a simple way, you can use a Service, in this Service you can set a Listener on a ref in your firebase DB when the event is triggered you can create a notify and show it to the user. There certainly is. Just have your Android app write the notification request into the database .
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Send a test notification message
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Notifications composer
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To get started with the FCM JavaScript API, you’ll need to add Firebase to your web app and add logic to access registration tokens.
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Send messages to multiple devices
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Generating the Service Account Credentials js code to communicate through the SDK to the Firebase messaging service and is generated from within the Firebase console . Click on the Generate New Private Key button, download the generated file and place it in a suitable directory on the system on which Node.
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How to Add Web Push Notification In React Js With Firebase
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