Create a file layouts/_default/_markup/render-link.html:

<a href="{{- .Destination | safeURL -}}"{{ with .Title}} title="{{- . -}}"{{ end }}{{ if strings.HasPrefix .Destination "http" }} target="_blank" rel="nofollow noopener noreferrer" {{ end }}>{{- .Text  | safeHTML -}}</a>

Done!

Source: Inspired by Elliot Sachs.