Posted by Alexander Schwartz on Dec 04, 2019; 9:52pm
URL: https://discuss.asciidoctor.org/Small-Issues-with-Font-Awesome-Inline-Icons-SOLVED-tp7211p7392.html

The current HTML5 output uses FontAwesome 4.7

The far/fas style was added in FontAwesome 5 AFAIK

You can follow the discussion on upgrading AsciiDoctor to FontAwesome 5 on GitHub.

So the answer to your question is "no" considering out-of-the-box options.

There is always the chance of pass-through content (with the caveat mixing HTML with AsciiDoc and making the result less maintainable) or writing an extension of an inline macro that supports FA 5.