wezterm implements support for the iTerm2 inline images
protocol and provides a handy
imgcat subcommand to make it easy to try out. Because the protocol is
just a protocol, wezterm's
imgcat also renders images in iTerm2.
To render an image inline in your terminal:
$ wezterm imgcat /path/to/image.png
Note that the image protocol isn't fully handled by multiplexer sessions at this time.