setting a background image with a specific height but with an auto scaling width

[vulbyte]

What Operating System(s) are you running on?

macOS

Which Wayland compositor or X11 Window manager(s) are you using?

No response

WezTerm version

20240203-110809-5046fc22

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hello! sorry for the the bother and just a quick ty for the awesome terminal emulator if you see this wez!

(for those wanting a tldr i attempted to bold the tldr so you can skim)

i have silly question i have been looking around for but i can't find a solution that solves this problem so i thought i would ask before attempting to learn something more jankey.

i'm currently trying to change my background just to be a small looping gif i like, however i commonly work with my terminal either snapped to half my screen, or full screen depending on my work, and i can't find how to have the width of the image auto scale when setting an absolute value.

i noticed there's apparently some form of css support, but when trying to do something such as:

aspect_ratio: 1/1;

or

aspect_ratio "1/1";

or

width = "auto";

none of the following seem to work. is there something obvious i might be missing?
if not, is there a way to make styles based on terminal width in px, or any other built in way to do this?

thanks for your time, any and all help appreciated! i included an image to attempt to help get a visual indication of what i'm trying to achieve, and the "raw code" is below so you can read it with greater ease.

thank you for your time and have a great day!

local wezterm = require 'wezterm'
local config = {}

local dimmed = {
    brightness = 0.02,
    hue = 1.0,
    saturation = 1.0,
}

config.enable_scroll_bar = true

config.background = {
    {
	source = {Color="black"},
		width = "100%",
		height = "100%"
    },
    {
        source = {
            File = "/Users/insert/dotfiles/.config/nvim/images/pixel_mangle.gif"--'/.config/nvim/images/loona7.png'
        },

	aspect_ratio = "1";

	hsb = dimmed, --{  hue = 1.0,saturation = 1.5, brightness = 1.0,} ,

        horizontal_align = "Right",
        vertical_align = "Bottom",
	vertical_offset = "-3.5cell",

        -- height = "Cover", USE THIS WITH NO WIDTH TO SET BG THAT WILL SCALE WITHOUT STRETCH
	height = "16%",
	width = "16%",	-- auto, maybe a "aspect-ratio = 1/1;" ?

	repeat_x = 'NoRepeat',
	repeat_y = 'NoRepeat',
    },
}

config.font = wezterm.font('New Font')

return config