docker manifest: allow to update an existing manifest with new images

I'm using gitlab jobs to build multiple images independent of each other for different architectures (linux and several windows versions).
My guess was that docker manifest create --amend {list} {image} would either create a new manifest list with the image passed or amend the existing list with the new image.
e.g. my assumption was

# job 1
$ docker manifest create --amend cli:0.0.1 cli:0.0.1-linux
# job 2
$ docker manifest create --amend cli:0.0.1 cli:0.0.1-windows-1809
# job 3
$ docker manifest create --amend cli:0.0.1 cli:0.0.1-windows-1909

would result in a manifest list containing the three images for linux and the two windows images.
This only works if you have the manifest locally already, however if you execute those three commands in different nodes or with clearing the docker directory in between, it would just always create a new manifest list containing one image.

Therefore I'd like a command which allows this, and/or a docker manifest pull command allowing me to retrieve the manifest list locally before updating it.

Start by tracing the Docker CLI handling for docker manifest create --amend and the proposed docker manifest pull behavior. Compare how the command handles a manifest that is already available locally with one stored in a registry. Done means separate jobs or nodes can update one existing manifest list with additional images, with tests covering the multi-command workflow.