How do I create a Jetpack Compose Image that resizes automatically based on a remotely loaded image size?

Question

I would like to display an image with the following rules:

• The image is remote and needs to load on runtime.
• We don't know what the image size is until it's loaded.
• The Image view should take the full width of the parent, and it should automatically adjust its height to match the remotely loaded image, so that no cropping/stretching occurs.

I tried using the Coil dependency and I have this code:

Image(
    painter = rememberImagePainter(viewModel.fullImageUrl),
    contentDescription = null,
    contentScale = ContentScale.FillHeight,
    modifier = Modifier
        .fillMaxWidth()
        .aspectRatio(3.21428f) // TODO: Figure out how to set height/ratio based on image itself
)

When I remove the Image's contentScale and modifier, its height always seems to be zero. I'm not sure what I should do to make Image fill the max width of its parent while determining its own size after Coil loads the image file.