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From Font Awesome · font-awesome.1

In Xcode, drag the template into an asset catalog, where it appears as font-awesome.1.

SwiftUIUIKitAppKit

Image("font-awesome.1")
    .font(.title)
    .fontWeight(.semibold)

Label("1", image: "font-awesome.1")

let configuration = UIImage.SymbolConfiguration(
    pointSize: 24, weight: .semibold, scale: .medium)
let image = UIImage(named: "font-awesome.1", in: nil, with: configuration)

let configuration = NSImage.SymbolConfiguration(
    pointSize: 24, weight: .semibold, scale: .medium)
let image = NSImage(named: "font-awesome.1")?
    .withSymbolConfiguration(configuration)