Date: Wed, 8 Jun 2022 18:53:13 +0200
From: Andreas Röhler <andreas.roehler@easy-emacs.de>

currently, icon-title-format is a variable defined in ‘C source code’.

As it's displayed at the top, it would be helpful, if it could display the version, for example.

What about making it customizable?

What do you mean?  Can't you customize it now?

Don't see how. Tried

(setq icon-title-format '(multiple-frames "%b" ("" invocation-name "@" emacs-version)))

with no effect.