Although About.jl isn’t, together with TerminalPager.jl v0.6.8 I think it (mostly) is. You can just use <alt>+<a> and <alt>+<h> with your text cursor on an identifier to get the output of about and of help?>, respectively.
Especially <alt>+<a> might be interesting for every regular about user.
See the announcement for more details.