Yet another font icons utility https://montemagno.com/using-font-icons-in-xamarin-forms-goodbye-images-hello-fonts/, which supports

• FontAwesome 5 Free

1. Add this assembly to your Xamarin.Forms project.
2. Download and extract FontAwesome 5 Free for Desktop from here (5.9.0 current).
3. Then, Add its OTF files to your application projects, and set Build Action BundleResource for iOS, AndroidAsset for Android.
4. Add their names to UIAppFonts entry in info.plist for iOS.

<dict>
    ...
	<key>UIAppFonts</key>
	<array>
		<string>Font Awesome 5 Free-Solid-900.otf</string>
		<string>Font Awesome 5 Free-Regular-400.otf</string>
		<string>Font Awesome 5 Brands-Regular-400.otf</string>
	</array>
	...
</dict>