can't use image that has been built for multiple platforms

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Hey I'm having trouble using in gitlab-ci an image that is built for multiple platforms.

When i have an image with the same tag that is used for multiple platforms and try to use it with:

docker buildx --platform <PLATFORM>

It isn't using the wanted image- in my case, arm and keeps on using an amd64.

We would appreciate if there was an option to create something like this in the gitlab-ci file:

image:
  name: myimage
  platform: linux/arm64/v8

This way we wont need to tag it explicitly and will be able to use CI_RUNNER_EXECUTABLE_ARCH env variable.

Thank you very much!