[QUESTION] Add conditional indicator to `mode-line-misc-info' not working

[Christopher M. Miles]

I added bellowing init config to my Emacs:

#+begin_src emacs-lisp
(add-to-list 'mode-line-misc-info
             '(image-mode (:eval (image-size (image-get-display-property) 
:pixels))))
#+end_src

But it's not displaying image info on mode-line when I open an image
with [M-x find-file RET /path/to/image.png RET].

I searched GitHub code for `mode-line-misc-info` examples. I don't know
what does the `image-mode` mean in upper code. Is it a condition which
only evaluate following `(:eval (image-size ...))` snippet in buffer
which major-mode is `image-mode`?

How to correctly add indicator to `mode-line-misc-info`? Please provide
some variant examples. Thanks very much.

Also the docstring of `mode-line-misc-info` is not helpful, please improve it.

My Emacs version info: GNU Emacs 30.0.50

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