eglot-server-programs, I rarely double-check to see if they actually 

work.  As Brian points out, it does seem to work in some installations

of this language server.

Just as a data point, I myself almost always start my servers with 

C-u M-x eglot and then proceed to find the right server using Emacs's

completion system. Even if the invocation is complicated, it will last

me through the session and  be available in my next session with 

C-u M-x eglot M-p RET (because I use savehist-mode).

João