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Android WebViewRenderer

using Android.Content;
using CustomRenderer;
using CustomRenderer.Droid;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]
namespace CustomRenderer.Droid
{
    public class HybridWebViewRenderer : WebViewRenderer
    {
        Context _context;

        public HybridWebViewRenderer(Context context) : base(context)
        {
            _context = context;
        }

        protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
        {
            base.OnElementChanged(e);
            global::Android.Webkit.WebView.SetWebContentsDebuggingEnabled(true);
            Control.Settings.AllowUniversalAccessFromFileURLs = true;
            if (e.OldElement != null)
            {
                ((HybridWebView)Element).Cleanup();
            }
            if (e.NewElement != null)
            {
                Control.LoadUrl($"file:///android_asset/Content/{((HybridWebView)Element).Uri}");
            }
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                ((HybridWebView)Element).Cleanup();
            }
            base.Dispose(disposing);
        }
    }
}

iOS WebViewRenderer

using System;
using System.IO;
using CustomRenderer;
using CustomRenderer.iOS;
using Foundation;
using WebKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(HybridWebView), typeof(HybridWebViewRenderer))]
namespace CustomRenderer.iOS
{
    public class HybridWebViewRenderer : WkWebViewRenderer
    {
        public HybridWebViewRenderer() : this(CreateConfiguration())
        {
        }

        public HybridWebViewRenderer(WKWebViewConfiguration config) : base(config)
        {
        }

        static WKWebViewConfiguration CreateConfiguration()
        {
            WKWebViewConfiguration config = new WKWebViewConfiguration();
            config.SetValueForKey(NSObject.FromObject(true), new NSString("_allowUniversalAccessFromFileURLs"));

            return config;
        }

        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);

            if (e.OldElement != null)
            {
                HybridWebView hybridWebView = e.OldElement as HybridWebView;
                hybridWebView.Cleanup();
            }

            if (e.NewElement != null)
            {
                string filename = Path.Combine(NSBundle.MainBundle.BundlePath, $"Content/{((HybridWebView)Element).Uri}");
                LoadRequest(new NSUrlRequest(new NSUrl(filename, true)));
                
            }
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                ((HybridWebView)Element).Cleanup();
            }
            base.Dispose(disposing);
        }
    }
}