How to set custom fonts in WebView(react-native-webview) in iOS?

I want to set custom fonts in Webview. I have implemented the below code:

@font-face {
    font-family: 'Poppins-Bold'; 
    src:url('file:///android_asset/fonts/Poppins-Bold.ttf') format('truetype')
}
body{
    font-family: Poppins-Bold
    margin: 0;
    padding: 0;
    color: red;
}

It works fine in android, but it does not working in iOS. Let me know if anybody has a solution for this.

Note: I don't want to use google's CSS font